I'm glad these are red and grey and not all black to be honest.  After dropping a black one in the grass the other night.  Spent 20 minutes searching a 9 sq foot area!  Seriously they need to not ever make removable storage smaller than these things.Other than that..it works great, no problems whatsoever.  If you need to reformat, it's suggested you use the sd formatting tool from the SD Association, of which SanDisk is a permanent member.  Windows doesn't exactly follow the specification, though for most uses windows format will work too.Here's the funny part.  This is about $2 more than the 32GB SanDisk class 4 card.  I've been waiting for those cards to drop in price as faster speeds take over...but they don't drop in price.  And thanks to the newegg free shipping on items over $25, it's actually cheaper overall when you order the $25 class 10 card and get free shipping instead of the $23 class 4 card plus $8.75 shipping.