Boss Katana Air

In short, I am disappointed by this product. As much as I tried, including using the app, I just couldn't dial a distortion tone that sounded good. The speakers just don't hold. The distortions don't hold up, going past half with the volume knobs ends up delivering muddy sound. The other knobs don't really deliver anything dramatic (bass, mids, trebs) and the FX and reverb have a small impact on the sound. Things only improve a little when you use the app, and theoretically you can create some good patches. But, again, it’s the speakers. If the speakers are bad, no matter what sound you play through them, it won't get better.
Oh, btw, don't expect low ends. All you get is mids and highs.

True, it's a very mobile unit, works on batteries, has a nice receiver thingy that eliminates the cables although it has some background zzzz noise! It also has Bluetooth, you can connect with your phone and jam with a backing track. But only in the house as it's not build for busking.

Conclusion: Unfortunately I must return. I have no satisfaction with this product.