Well... it's nice to have some UNIX burning software running on your Mac and X-CD-Roast uses the cdrtools as burn engine. It's completely independent of the Apple provided CD-burning drivers and 100% freeware. So it's very possible that X-CD-Roast works just fine with a writer that is not supported by Mac OS. Also X-CD-Roast has a lot of interesting options - like overburning support, creating real UNIX/Joliet CDs, multisession, CD-Text, high quality audio-extraction of even most copy-protected audio CDs, DVD writing without special software and more...
Please keep in mind that this is software that has grown over 6 years. It's not at all Apple-like. It might be confusing at first, so please read the popup help on each button. (Hover your mouse a few seconds over an item to get help.) The text documentation is installed into /usr/local/lib/xcdroast-0.98/doc, so you might take a look.