So far I've done about 10000km on 2 schwalbe One HT tubulars (both 24mm). I've only used them as rear tyres as ive had veloflex extremes on the front for the past year. I really can complain about the Ones. Ive never had any handling issues and they seem to roll well...although I know the Tour Magazine test says they arent the fastest. In 10000km ive punctured a One HT once. That particular tyre had worn so much (about 6000km) that I could see small patches of cotton casing through the tread. I knew it needed replacing but at the time it had been raining so much that I'd only been training inside so hadnt bothered. When the sun suddenly poked through one day i took the chance to do some hill intervals near my house. I knew full well that there was gravel at the top if the hill and id likely puncture but decided to risk it anyway. Needless to say I noticed a slow leak at the end of the work out so just rode the whole 1km home on the flat tyre. I wouldnt have expected any other tyre to fair any better.
The veloflex extremes, carbons and vittoria corsa cx (isogrip) tubular tyres ive used are more supple and offer more feel but in the last 10000km ive punctured 3 times on veloflexes and have only had the vittoria on for about 600km.
fwiw probably close to half of this years riding has been on wet roads or int tye rain. I never worry about tye schwab letting me down...just the sexy veloflexs