I asked and was told that they won't take it back opened, but I had 15 days to return it if it doesn't work.

Think the latter part was the employee telling me how to get around the return policy.
Thats kinda why I wanted to check here first to see if the drive works before going back to deal with CS.
edit;
Opened it.
Write time is a little slow (+25 minutes to install 5.7gb game) but it has no problem playing games.
Not a fan of Halo, so I had to buy it for my nephew so that he could play Halo 4 on his Xbox (and not mine

)