My aquapacs have survived beaches and rainforests in Costa Rica, with no problems. They haven't gotten brittle in -0 degree F weather. The ONLY modification I've made is to make the neck lanyard break-away (using lamp wick - per Chris K's thread years ago). I've used the one they make for cameras on white water raft trips, and have been pleased. They don't protect much from impact, but the camera stayed dry (and can be operated within the pac). I quit carying the altoids tin or any other hard case after being dumped by a horse and wearing a tin-shaped bruse for a week or so.

But again YMMV. I don't hear from other users here in the ETS forums, so you have only my experience.