I have about 1500 miles on my planet x 50 mm tubulars. Carbon Clinchers scare me and test out some renolds dv46 (i think) carbon clinchers. Lots of front wheel flex. I got the px team tubs for $620. They claim weight limit of 200lb but rode the piss outa them at 225 and with the sapim cx ray spokes they don't flex at all. I run conti sprinter with stan sealant and never had a flat yet. I still carry a pre glued tub in my jersey pocket just in case. Even done a few 5000+ft decents and they hold up to the heat just fine.