I just put corsa cx on my 404s and LOVE THEM. the ride is magical and night and day difference compared to the conti sprinters I was running. the conti's were butyl based though and it shouldn't be surprising that I noticed a difference.

My logic is that race season is from march to august for me.I can pretty much use them for races and occasional ride for the whole season and switch to my trainer wheels during the weeks. It was a bit pricey but I will be able to justify it if it lasts the whole season. I don't expect more than 1200-1500 miles.