Stands a good chance of not being able to boot OS X from a non-Apple external optical drive ... not that it matters with a brand new system and Internet Recovery, and also the ability to install the OS from a USB key, but still ... it should be pointed out that if you own an older SL Mac, and you want to reinstall OS X SL on it from the DVD's it came with, you probably won't be able to unless it's an actual Apple USB SuperDrive (or you still have the internal SuperDrive in it.)
Pointing this out in case somebody finds this thread with the search feature 6+ months from now.
You can boot from any external DVD drive
@OP or you could just buy one with an optical driver built in..