I have and love my C1, however I use it as a closeup vocal and amp mic most of the time, not in stereo, although I have used it as a room mic for horns, blended in with a dynamic mic close up (sm57 on trumpet and Peavey 520i on tenor sax) and it worked really well for me in that context.
That said, my impression of the "stereo room mic" thing is that most people want room mics that fall into one of the 2 following groups:
1) Really nice accurate flat-frequency response mics - eg B&K/DPA/Schoeps/earthworks/Neumann km184 etc. in the expensive category, cheapies might include Behringer ecm8000, MXL603, Oktava MC012 (not that these have flat responses, but they're not hugely flattering, they just give a nice picture of the sound
The C1/T3 are not your cup of tea (IMHO) if this is your wish
2) Mics with a bit more character (and you can compress to hell and mix to taste for weirdness!) - Royer ribbons, Neumann U87's/TLM103's/whatever else, BLUE mics, Coles, etc in the expensive category, cheaper versions might include various mics by Rode, Studio Projects, Marshall electronics, Oktava 219/319 etc - the better quality cheap chinese LD condensors.
C1 and T3 may well work for you if this is what you're after. And you'd also have fine vocal/cab/misc source LD condensors at your disposal for other things if you had them
Steve