I've been using my Katana Bass 210 for a while now (I think I got it within a couple weeks of them being released). I can really only echo the same thing that's been said many times already... it is great to have everything in one package/combo, even if it is a rather heavy package. The effects work, and serve a purpose, but I wasn't convinced enough by them to ditch my stompboxes. I can get a great tone from it (I tend to favour a bright sound like Tim Commerford) and it is more than comfortable playing any style that I throw at it.
My only gripe with the Katana bass is that the outputs all seem to clip and sound terrible. I've tried going out of the DI out, headphones and even the USB and just can't get it to sound good. Which is a shame because it sounds beautiful coming out of the speakers. As a test, I played through an ampeg preamp pedal plugged into the 'power amp in' socket (which disables the on-board preamp and processing) and all the outputs work fine and sound as they should. Has anyone else experienced this?