Both the USB2 and Firewire interfaces work fine for reading and writing. This is a nice case since it has a fan, but still pretty quiet. Avoid an external case without a fan since DVD-RWs can get hot when writing.
Just about any DVD-RW drive should work fine these days. Be sure to get one that can burn dual-layer media.
Actually I went out and got a Pioneer Double Layer burner and put it into generic usb2/1394 case. Actually, the brnad name is Piodata but it's actually a Pioneer drive without the pioneer label. It little bit cheaper too.
they are a total pain in the ~~~ - and I am taking them apart constantly to try and get the fans seated in such a way that is even marginally tolerable w/re to humming and buzzing and sawing against the internal parts of the enclosure - and have now resolved myself to just leaving the tops off - removing the fans (which are btw dead silent when running outside the enclosure) - it's ridiculous
tech support is clueless ("...uh...loosen the screws?...")