I got the Vai version
I got the Vai version first. After using it for a few months, I bought a second one, because they are such good sounding amplifiers. It is not high volume, perfect for practice, anywhere, because it mutes when the headphone jack is in use, and it is battery powered! The batteries last; I have yet to have them rum down during my long, fun, noodling sessions. 🥰 I am happy with the customizable grille covers that I had made. I use this amp as a preamp for recording guitar now. The Spark Mini has 4, completely adjustable preset positions onboard, user definable, with 40 amp models, 6 inline, effects can be chosen, for each savable preset, from a wide variety of signal processing stomp box type effects, that are good quality, all accessed through the free Spark App. It has a tuner built in and accepts Bluetooth audio from other Bluetooth enabled devices. Spark Mini includes Jam Tracks, via the app, that are great for practicing! The guitar volume and 'Music', or Bluetooth Audio volume have their own volume controls. It sounds like a much bigger amp. I take it with me, in my car, and can jam anywhere I park it! Really, worth the money and much more fun than I had anticipated. Great preamp for mobile recording! USB-C, 3. 5mm TRS and 1/4” TS for outputs cover most needs. It sounds bigger than my Roland Cube, and is preferred, by me.