I have a valve amp, a kemper, helix, and a THR10X. I wanted something completelly wireless i could use in the living room, the new THR10 is way expensive if you include the transmitter and i dont like the sounds on the Katana air. The NUX surprised me, i wasn't expecting it to sound so good for such a low price, the cleans are actually pretty decent ( better than the THR10) and the drives, although boxy sounding ( there is no way around such small speakers) have an inherent very usable tone.
Does it sound like a tube amp with a 12" speaker? No, but considering such a small footprint the sounds are very usable and the app is easy to setup, for the price it's a steal, you could get a THR10 wireless for 450+100€ for the transmitter and that would translate to 4X the cost of the NUX (and i think the cleans are actually better on the nux).
The only thing i miss is an inbuilt tuner, apart from that i think it's a brilliant product.