I have just purchased a set of Gatorskin hardshell 700 x 23. I have purchased puncture resistant tyres before, and found them to be a little sluggish, these Gatorskins however are very good, and quick. I have them pumped up to 8.5 bar and have had no problems. The grip is very good, my average speed has increased by around 3mph, I don't know if that is the tyres or my fitness increasing, but I am very happy with the ride. these tyres seem thinner than my previous tyres, even though they are apparently the same size and width.
I ride on some terrible roads, plenty of pot holes, and glass and it seems that these tyres haven't even been scratched!
Fast, durable, puncture resistant, light, very thin, yet have plenty of grip.
The only thing I would have liked would be a selection of colours, as my bike is black and can look a little dull, but the tyres are faultless so far. I do around 20 miles 4-5 times a week and they are still like new.