I ran michelein lithion 2s over the winter, and now run them on my training wheels. Fast, punctured twice all winter (not at since February), dirt cheap - that's riding 12-20 hours a week. If push came to shove I'd happily race on them - I also plan to use them for a 1000km audax coming up.
I think the only reason that more people do not buy them is that they are so cheap - which leads to people assuming they are crap.
Not a huge fan of gatorskins - they last forever, but are slow and get really slippy in the wet. Cheaper Continental tyres don't seem to last at all. GP 4000s are all the rave but I have yet to try them - they're the most common racing clincher by a country mile. Scwable blizzards and vittoria zaffino's are slow and heavy, but dirt cheap and don't puncture all that much - last a while as well. I race on mich pro 4's - I wouldn't recommend them for day to day use due to durability.