I've had three HP1s, a 436 bought a few weeks after it was released, and a 536 bought this past January, and each one of them has had a SanDisk 32GB class 10 (red and grey) card installed almost immediately after receipt of the radio, and not to this day have I experienced corruption. I'm using the record feature on a constant basis, too, so the cards are getting pretty serious workouts. I'm curious if there's a common issue or action between those who have experienced card corruption. For example, I have almost never physically removed the card from any of my radios. I do all the data transfer through the USB port. Another theory is power interruption - I've never shut off the 536 without letting it write to the card. The 436 on the other hand has run out of battery many times, including a few times where the drain was sharp enough that it didn't have time to finish gracefully (no writing to card). Maybe I've been lucky in that those instances haven't proven fatal. Or maybe it has something to do with the internal battery issues? Because I haven't had those problems with either radio.
It's true you don't need 32GB, so if you find yourself needing to replace cards regularly, a smaller capacity card does indeed cost less. But I'd hesitate to claim that all cards always fail - I'd try to find a commonality between those of you who have experienced failures.
