Mine was a Christmas present to myself, and I have to say that so far I'm pretty impressed. It sounds eerily similar to my MB200, which is what I was hoping for. Solid and grunty. I use only the clean channel, and none of the boost control. Seems to have lots of power, though I haven't really had a chance to wring it out yet. I breathed a sigh of relief when the fan came on during first practice with it. I hope and expect it'll be trouble-free, 'cause by this stage of the game these things ain't "Revision A" any more, if you know what I mean.
This G-K stuff is great. Wish I'd taken the plunge years ago.