I do own a Boss Katana 50, for bedroom use, I find it more than enough for my needs. I was able to crank it up full volume last new year and I find it loud enough to do small bar gigs.
As for the sound, I find it quite trebly, but probably its just me, since the pickups I use are high output and trebly in general, so I always set the treble knob to about 10 o'clock, the cleans are good and you can get a lot of good tones from it (especially if you use a strat) with a little bit of fiddling around the settings. The dirt sounds are where this amp shines most in my opinion. I really like the brown setting, and with a little bit of experimenting, you can be on this setting pretty much all the time.
What I particularly like about this amp is the amount of stuff you can do with the effects and using boss tone central. For me as a practice amp, this amp does it all.
Happy amp hunting!