I spent almost an hour with one of these today in my local music store. Got a chance to play with it doing a lot of different tones and I think I have a pretty good feel for the basics. I wish I had had one of my own guitars there, but tough. Anyway, at its price point ($199) I think it's probably untouchable and I am considering buying one pretty seriously. I have some great tube amps but they are either too loud or too heavy (or both) for me to deal with, especially if I want to go play somewhere. They are great for recording, and that's what I use them for. This sucker is quite loud but also sounds great at lower volumes, it weighs only 25 pounds (it's got quite a small form factor despite the 12 incher), and it has a good sounding 12" speaker. Boy, solid state has come a long way...the clean tones are fabulous, but it also seems to do the slight breakup tones well too, which is something that I haven't heard from a modeling amp before. Tons of really dirty sounds, but it cleans up very well. They have done a good job with this one. A word about the effects, which IMO are one of the amp's strengths and one of its weaknesses; they sound great, no doubt about it. The problem is that you can only use three at once, and IMO the control you have over them is very limited unless you are editing on a computer, but even then, you eventually have to save your new patch to the amp, and then you're stuck with all your tweaked settings except for the one the knob will let you adjust (for example, on a tremolo effect, you can adjust the speed, but not the depth. So if you change that for your new patch, you'll still have the same problem when you are back to the amp alone again.) The fact that you can only use three at once is sort of a problem, because one of them is reverb. I like reverb, but one slot is always reverb. That leaves only two others out of a potential herd of 55 effects. The out-of-the-box amp doesn't have THAT many, but IIRC it does come with 15. So, oddly enough, given that Boss is known for its effects, I have to give the amp a minus here. And yet, for this price, it's really worth considering. I have totally enjoyed playing my RP500 through the Twin, but that Twin is so heavy and the trunk of my Scirocco so hard to get it into that it's staying home. Having said all that, I compare the way the amp sounds with my '69 Twin and I think that on clean tones it does just as well. It won't get as loud as the Twin, but I don't want to. And the Katana does get loud. I'm used to inflated watt ratings from solid state manufacturers, but I can say it does get loud. And the dirty tones are nice too. All in all, it's an awfully interesting offering. My local store has it for $20 less than Sweetwater, too.