Welcome to Mac.
I just bought the LG external GE24. Hooked it up, plugged in and put in a disk. My Mom's iMac (20" Dec 2007) found it and ran the disk. The disk is the Snow Leopard upgrade/install disk. Worked without a hitch. I had to buy and use the external GE24 because the internal superdrive that came in the iMac is broken.
The Installation CD that came with the drive is for Windows only.
Note: the apple DVD player will not run a video DVD from an external player. Licensing restrictions. If you try, you will get this message:
There was an initialization error
A valid DVD drive could not be found. {-70012}
I downloaded the VLC player (free) and this works fine if I ever want to watch a DVD from the external LG GE24.
Interesting though, my iMac (21.5' Oct 2009) has a functioning internal superdrive. When I plug the LG GE24 into my iMac, the apple DVD player will play a video DVD.
I have not tried to burn to the GE24, but I'll bet it works using the normal Mac software to burn CD's and DVD's.
Have fun.