Good at what it does, but... flawed by unresponsive developers?,
This review is from: Roxio Toast 10 Titanium (MAC) (CD-ROM)
Doesn't handle Matroska .mkv's, and judging from the forums, the Dev team don't really care unless Apple fix it for them.
The whole point of Toast these days is 'everything in one place' so that you don't need to root around for flakey file converters that may or may not work to get your data fit for whatever picky app you want to put it in.
.mkv's aren't a new format and more importantly aren't proprietary. Possibly a little more complex in terms of what might be in there (.mkv is a media containing envelope that may have many audio/video streams within - this is it's major strength), but with playback available easily on free-ware, there's little excuse for something that's main selling point these days is format-handling and costs money still not supporting a format a couple of years after it became popular.
If I still need to go hunting for converters that I may need to buy licences for to ruin my files by compressing them coarsely and forcing them into ancient formats to use this to burn a simple dvd, why do Roxio think it's still worth the asking price?