Pros: Inexpensive and they work fine. I'm using the BEFW11S4 router with the cards. The Ver 4 worked right out of the box, set up too easy. The Ver 3 card needed some tweaking, but the Linksys support walked me through it, now problem (very nice). Range seem
Cons: Better documentation on the Ver 3 vs Ver 4 card porbably would have saved me a call to support.