Gator Lift Drywall/Plywood Panel Carrier

I have one of these, best thing I ever bought. I can carry an entire sheet of drywall up two flights of stairs without destroying anything! Be warned that if you are wimpy like me your wrist may be sore the next day, though

Is there a rated weight limit on the rubber grips before it will give out? Would hate to carry something heavy and have it slip out.

It is rated to 200lbs, and the great thing about the design is that the heavier the panel, the tighter it grips!