I think the Gator Hardshells are slightly more durable than the Gatorskins.
My most significant issue with them is that I did have a blowout about 75 miles from new. 700x23, Gator Hardshell, I think. 110PSI or so inflated during the cool evening the night before the ride (some warming the next day). I've backed off of the pressure slightly. While I like midnight tune-ups before heading out on the road, it might be best to let things like the tires settle in for a week or so.
Anyway, my blowout terrifies me. It is aggravating trying to make a road boot on 3" of bead separation. However, I still like the tires. But, I'm not beyond experimenting with something new either.