Yamaha THR10II

I bought this before, and after having tried quite a few other solutions for guitar practice, I returned to this for one thing: the sound. It does sound more natural and useful. I play both clean, crunch and "heavy" sounds, and in particular the high gain sounds is where this little box of wonders shines above the competition. Its not at all Kemper level, but it is good enough that a tube-amp lover like me dont get distracted, as i did with the Spark amp. The Yamaha is also very well organised, and (unlike the Spark) can function well for wireless playback. It is loud enough for jamming with a friend, and well made. Seems sturdy and is even somewhat good looking. I have yet to come across a modeller amp that doesnt produce some weird artefacts at very low input signal and high gain, and this is not exception. Even the Kemper does it (a little). The noise gate is helpful in keeping it down, and the app is excellent for dialing in more precise sounds than you can on the front panel. This time, i will not sell it :)

It is a good amp, however it has a few negatives. I play mainly rock, r'n'b, blues, funk etc. so I mostly focus on the clean and crunch sounds.
Let's start with the positive things. The amp is really light and it looks really good. So you can keep it in your living room on the bookshelf of wherever. Since it also works as a bluetooth speaker, you can use it as a speaker for the room. The sound of a bluetooth speaker when playing music is ok and it is loud enough. The amp has many features, mobile app, USB recording and all that. So, packed with features.
Sound of the amp is ok. To be honest, I expected more after reading and watching the reviews on the internet. Maybe small, BT amps with small speakers are just not for me. To my ears, Boss Katana 50 sounded much better. As did the Fender Tone Master Deluxe, but that one is much more expensive. But again, sound is not bad, it was just not as good as I expected. A little bit too artificial.
The other problem with the sound is that volume levels really differ between channels. Clean is really quiet, Crunch is louder, and the others are much louder. I expect that for same master volume/gain/volume settings to be the similar loudness. But that's not the case. Again, this is not a big problem, since you won't be switching amps all the time.
The mobile app could use some UX improvements. Not everything is logical or user friendly, but you get used to it pretty quickly.
My biggest problem with the amp was that mine was defective. It has a loud high frequency squeaking sound, especially audible on single coil guitars. On humbuckers you can still hear it but barely. I read that it happens on some of the yamaha amps, but not too often. So I was probably unlucky.
Fortunately, I bought it at Thomman, so I didn't have any problems returning it.

It sounds amazing and dialing a good tone has never been easier. It also has bluetooth and can be used as a wireless speaker to play along or just listen to music. I can't tell you how good it sounds but there is certainly some magic going on because the sound that comes our of this tiny speaker is so spacious and clear that it blew my mind away. It sounds much, much better than the Katana IMHO.
I expected more features though, it has all the basics but lacks some nice effects that I would've wanted especially a looper. There are some features hidden in the software provided by them so you have to use it to access those features, this might be off-putting for some people but it's easy enough to do it either wirelessly from your phone or with a usb-b cable from your PC so I don't really mind.
The amount of presets to choose from is good and it's even more when using the software and all of them sound amazing.
The quality however is worse than on the previous generation, the body is now made from plastic too and is not completely metal. You can't power the amp from batteries anymore feature that I would've liked and I miss the old power switch.
Overall I would highly recommend this amp, it might not the best bang for the buck but it's certainly the most convenient solution for home use and practicing since it's so small that it fits anywhere without any compromise to the sound and it's use extends beyond guitar practice since it can be used as an amazing bluetooth speaker.