Dual Superdrives - Is it needed?

I burn a lot of DVD's. I was thinking of buying two 18x Superdrives to replace the one already in my MDD PowerMac. The current one is stock (2x) and doesn't burn fast enough nor does it have DL capability.
If I install two, will there be any benefit? Am I able to burn two DVD's using Toast at once? Or is two really only helpful if I am doing clone copying?
Bryan

i don't think you can run two copies of Toast, unless you have them with different names. I have two burners in my Mac Pro, mainly to read and write at the same time.