Nothing scientific about this suggestion.

We have polycarbonate glasses from Williams-Sanoma that have been through the dishwasher for at least three years. None have cracked like our previous clear plastic purchases. They are a bit cloudy but not too bad. I do not baby them.
We have Target brand polycarbonate glasses in our RV. They are hand washed, much newer, and used less frequently so they are crystal clear.

The WS glasses were expensive compared to the Target. I can't say if the Target will hold up under the dishwasher like the WS. Anyone out there have Target polycarbonates that have experienced dishwasher abuse?

The cracking in the dishwasher was the major drawback with the non-polycarbonate versions we had previously used.