I have 6 Transcend cards (2GB, 4 GB & 8 GB in various speeds) and they have never failed me (however I had another professional famous brand once die on me). Transcend is my preferred card and I recommend them to all my friends.
Large capacity & great prices; Can shoot entire event with out running out of memory at a critical time; One less item to keep track of during a busy shoot.Great if shooting RAW
No real cons; but archival backup now takes two dvds