Excerpt: I use these in my GPS to store the extended maps for North America and also for Europe. These are now >3GB so I need the 4GB cards. They've been reliable in the past and I just got 4 more to use for the new maps (I always have a backup with me ;-}). Overall great product that does what it is supposed to do. I would have preferred the old packaging with the plastic box for storage outside the device but that's a small matter. Also the writes are slow.
Pros: Easy To Use, Great Value, Large Capacity, Reliable Performance