Originally posted by: PandaBear
U3 are only produced by either SanDisk or M-System (rebadged into various other brand), and now M-System is part of SanDisk. IMO if you are using primarily U3 then get the M-System clone as they have a lighter weight U3 implementation, but if you don't care about U3, then SanDisk Extreme IV is the fastest out there (but cost more).