Well I've just sent back 3 ShuttleMax12,2s, not because they sound bad, just had a few issues with them (1st one a power input housing clip cracked, 1st replacement was a return (bought a new one) and the last one got squashed by someone in transit to me!). I liked the versatility of the two channels, and I thought the overdrive on the tube channel was fine (at least for what I wanted!). The FET channel did sound really nice (through my two Markbass cabs). I did notice the fan on the ones I had was louder than I would have expected, but I guess when the band is playing no-one would hear it anyhow.
I now have a Shuttle 9.2 and a Streamliner 900 (oh, and an old Shuttle 6.0). I really dig the 9.2, great sound via the above cabs with a decent amount of drive needed if that is what you're after. I've only played with the Streamliner in the house and so far the one thing that I really like is the treble control, if you turn it down it's not too far off a passive tone control on a Jazz or P, really nice tone.
I haven't head that much difference in warmness between the two, I suppose my cabs do tend to give a warmer sound anyhow. One thing to point out is the 9.2 is smaller than the Streamliner, not by much, but if that is an issue it might be worth mentioning.
Any more questions just ask