I received the R600 head and the 2x10 yesterday. I was very impressed! The quality was great! I haven't played around with it much yet but I was able to get some VERY nice sounds out of it. I was very impressed by the impact the horn made on my overall tone. One thing I'm unsure about is the BLEND control. It is supposed to control how much of the signal is passed through the tube emulation circuit. As you turn it up the sound seems to lose some of it's bottom end and if you turn it up all the way it just gets real harsh. I haven't played through many real full blown tube amps but the ones I have played didn't sound like that. It's not bad sounding, it's just different than what I expected. I need a lot more play time to get the feel for this thing but so far I think Carvin has given me exactly what I was looking for in a new rig. We will know for sure when the 1x15 gets here today! :^) Oh, yea, did I mention the quality!!