FWIW, I have had three of the cards in Pis running 24x7 with a sustained low workload of writes (logging and server log files), one for www.pidramble.com, and t

FWIW, I have had three of the cards in Pis running 24x7 with a sustained low workload of writes (logging and server log files), one for www.pidramble.com, and two for an internal data collection project, and have had no card issues in that time. The cards I've tested < 6 months include the 300x Transcend, the SanDisk Extreme, and the Kingston C10 (which may be slow, but is fine for basic logging purposes).