My wife has daily driven her 01' cobra with 4.30's for 35k miles including 2 winters, and 3 500+ mile road trips and 35 mile round trip for work. She LOVES them. Everages about 300 miles a tank. I love em too.
Just installed my 4.10s. I can feel a difference from the 3.55's. I may join the "should of went with 4.30s" club, but i think they're fine and way better then the stock 3.55's.