I have the Kingston version. I have 25g used, and I leave it that way. Use it for read only , so write speed spec is not a factor. Theres a vbs program that can time your shutdown-(including bios)reboot time-working windows desktop, mine is 36 seconds. Its impressively fast !
How to See What Your Windows 7 Restart Time ishttp://www.sevenforums.com/tutorials/720-restart-time.html