I still ride tubulars because I have a nice tubular wheelset and I don't really want to spend another $2k+ just for clinchers. I've always had good luck with tubulars and enjoy riding them. At any rate, I've always used Continental Competitions (butyl tube) and have never had any issues. I train on them and race on them. When I get a flat (only happened twice now) I unscrew the valve core, pour in some sealant (I carry a 2 oz bottle of Stans), put the valve core back in, hit it wth some CO2 and I'm on my way. I do carry a spare tire on longer rides/races, just in case, but I've never had to use it. Lately I've been eyeing the newer tubies from Vittoria - specifically the Corsa G+ and Corsa G+ Speed. I'm interested in the Vittorias for both their lower rolling resistance as well as the nicer ride I know a latex tube will provide (plus Vittoria makes a more supple casing). My questions about the Vittorias are mainly around fixing a flat on the road:

1) The removable valve core on a Vittoria seems to be a little different - it looks like it goes all the way down to the tire. Is this the case? If so, I presume I must add the sealant before I glue the tire instead of when I flat? Out of curiosity, can I thread a normal valve extender on with a valve core at the end (like the Continental extenders or the Silca removable valve core extenders)?
2) I've read that CO2 slips through latex mighty quick. Will the CO2 + sealant combo give me enough tire pressure to make it home/to T2? Worst case here would be 5 hours if I got a flat right out of the gate.
3) Please tell me the Vittorias mount easier than the Conti Competitions. It is always quite a struggle to get new competitions on the rims to air up and stretch for a while before gluing...

Any firsthand experience with either the Vittorias (or switching from Conti to Vittoria) would be great too!

Thanks!!