I had an 8GB Transcend (used to boot from) and it died in 3 days. Totally dead, nothing would revive it. I now use a 2GB SanDisk to boot from, a card that I've been using as my primary SD card for 2 years, and not single problem. Sheer probably says that after all that time I would at least have a little corruption at some point? Nope. I also have an 8GB Kingston (had it a few months), and also no problems.

Transcend has convinced me. Over time, a cheap SD card is an expensive SD card.