"Here are the main points as well as suggestions and I’ll give some pros, cons and notes and tips after.

First, for the price, this is an AMAZING value if you’re going to use it to it’s full potential.
Second, it sounds okay on its own, and much better through headphones.
Third, if you like to play along with songs or just drums, you’ll love it.
Fourth, if you aren’t familiar with the Spark amps, know you must use a phone or tablet with it for many features.

The Spark Go is a very small practice amp. It’s small enough to fit in a gig bag or some hard cases. It’s battery powered and charges via USB-C. The battery life is said to be 8 hours at mid-volume. I’ve gotten at least that but I primarily use headphones with it. It has a small 2” speaker and a passive radiator. This gives it a MUCH larger sound than you’d expect for its size, but it doesn’t sound “big.” The amp allows you to store four sounds or channels directly to the amp that are switchable by a single button (a foot switch is available.)

Should you buy this?
I’ve been playing for 35 years. I have some excellent amplifiers and all the effects I could ever need. Does this sound as good as my various rigs, LOL, no, not even close. I still like this enough that it gets a lot of my playing time. Why? Because it’s there. What I mean is the Spark Go is so small and convenient, I can just plug in and play. I don’t even have to go upstairs to my music room. This even fits in some of my guitar cases, so if I have enough room to take a guitar, I can take the Spark Go. The best thing you can do to become a better guitar player is to play. The Spark Go encourages you to play because it’s as easy as plugging your guitar in. Don’t get me wrong, you can tweak tones all day, play along with songs and many other things, but if you just want to play, you can.

For the price of a fairly cheap effects pedal, you get a LOT out of the Spark Go. For the novice guitar player, this is a no-brainer: GET IT. For the intermediate or advanced players; if you need a battery powered practice/headphone amp and like to play around with different tones, this would be great for you too.

Pros:
Being able to search for songs and play along is really neat. The app attempts to give you a real-time chord progression as the song plays. This isn’t perfect, but good enough to help you learn and play songs.

Access to community-contributed sounds is an excellent addition. I’ve been playing for 35 years. I know how to dial in sound similar to Slash’s. Newer players aren’t going to have this knowledge yet, so being able to search for a Santana or Mustaine sound is a great thing!

It can be used as a stand-alone amp. It comes with four sounds pre-loaded, but you can, of course, change those. You don’t HAVE to connect your phone or tablet to just plug in and play.

It can be used as a simple Bluetooth speaker. Sure you probably already have one, but if you carry this around you not only have a Bluetooth speaker, you have a guitar practice amp too.

It can be used as a direct recording interface. Recording your own music can be a lot of fun (also, very frustrating.) Because this can be used as a recording interface, you can record some tracks very inexpensively.

Because the device, and obviously the app, are software based, tones and features can possibly be improved and added.

Cons:
Putting the input and guitar volume at the top is a complete mistake. This causes the amp to topple over very easily. They should have put this on the side and towards the bottom.

Smart Jam is not quite there. It’s a great idea, it just doesn’t work so well. It will pick up on simple chord progressions, but nothing very complex. I found the AI drum patterns to be lacking too.

The amp models are less than authentic. Positive Grid notes that amp models are “inspired by” certain real-world amps. The biggest problem I have is that the models don’t operate like the real thing. I’ve owned a lot of Mesa/Boogie amps. The tone controls of the Positive Grid models don’t operate in nearly the same way, so it’s really hard for me to dial them in.

I had to update the Spark Go firmware via my PC. This should have been able to have been done via the phone/tablet app.

Notes:
I first used this with my Android phone. It connected and everything worked fine. However, I decided to switch and use it with my iPad. Getting the device to connect to my iPad after it had already connected to my phone was a bit of a pain. I was able to find the solution on the Positive Grid website though. I do recommend you use this with a tablet if you have one.

When setting up sounds, watch out for the noise gate. You can easily kill your tone’s sustain with it. I suggest you only use a noise gate with really high gain sounds, and only then with as little of it as possible.

Tweak away! If you download a sound that’s supposed to be Eddie’s Brown Sound, you don’t have to keep it that way. Play around with it. That’s a big part of the fun with modeling amps."

"First, and most importantly, it can do exactly what it promises - provide great sound quality in an amazingly small package. The range of amp and pedal options is almost unlimited. I’ve tried several presets and liked them all, but I tweaked a few to work better with my particular instrument. Most recently I created a preset to make my lap steel sound like a pedal steel, which wasn’t hard…and the result is wonderfully clean and rich. I just tried a bunch of amps until I found one with a nice tube sound, then added some compression and a bit of reverb. Perfect.

My ONLY complaint is that the Spark Go is a bit tippy. A heavy guitar cable can pull it over if you don’t have it angled just right. A broader base either as part of a redesighn or a clipon would be good.

That is it. For what I wanted - an inexpensive amp to travel with and to use as a sound shaper when run through a larger amp - this checks all the boxes."

"I love this thing. I got it for playing on the porch, but have found so many other uses for it. I had a Boss Katana that I sold because it was soooooo noisy. I can run out of the headphone jack of the Go into my studio monitors or my interface to my computer to the monitors. Works great as an interface for recording. I recently bought a Vox AC15 tube amp and I use this as my processor for it, believe it or not. Guitar into the Go, headphone out to the Vox and now I dont have to buy pedals for my new amp. It sounds great and no digital noise like the Katana. I went to a concert a month ago and stayed in a motel a couple nights. Took this and a Tele and had a blast. So many uses. Such good quality for the price. Are there features I wish it had, sure. Are there things is doesn't do or things that sound better? I'm sure there are. Is there one that is as versatile for just over a hundred bucks? I doubt it seriously. I highly recommend it."