Just hope it doesn't **** up stuff due to the faster drive, as I heard that can happen.
The problem with 7200rpm drives these days is it generates more heat than a 5400, obviously since you're going to be using a 3.5" drive externally that won't be a problem. A few months ago there was a problem with the PS3 in certain games where a faster drive would cause it to crash, however apparently firmware updates have fixed this.