Congrats! Looks like you've already got a Studio there, so you probably won't be as totally in awe of the Quad as say, I was, when I first got mine, but it's a frackin' awesome piece of kit. I've only had about 5 minutes of experience playing through a Studio and can't really compare them (aside from knowin that there's some serious similarity) but even though I think they may not be the brightest spot in the preamp, the Rhy2 and Ld2 are pretty killer. Rhy2 in the Quad is one of those unsung heroes of guitar tone to me (I don't use it much either, heh, but it's easily the most versatile channel on the Pre and it sounds pretty awesome through all the ranges of possibilities to me; particularly when it's really cranked, the possibilities of a pretty sweet singing/OD lead tone and a nasty sounding crunchy rhy tone are awesome. On my settings, the bridge PU at full bore sounds like a hot-rodded brutal version of old Thin Lizzy-esque crunch, but the Neck PU rolled back a bit is a sweet, singing bluesy lead tone. Mmm.
Altogether I'm jealous, of course. How you liking it, and how do you think it compares to the Studio?