JAZZGEAR is right on.
Cleans on RK2 = wonderful (especially with a piezo)
That was what made me pull out the plastic in store upon demoing when they first came out rather than buying an RK1 on the used market. If you have played and liked the RK1, you will equally like series 2. Not to say series 1 isn't great on its own (it is) but channels 1&2 along with the reverb are distinctly different. The reverb can almost reach delay levels on channel 1.
Be warned, roXor, since you said you are new to Mesa that different guitars will really emphasize different elements of the tone stack with this amp. I hear the differences in wood, pickups, etc. between my PRS CU24, superstrat-style EBMM JP1, and lespaul style McNaught guitars more so with this amp than any of the many I owned before - at least I do when I am not competing for air space with other instruments 8)