I've tried the myDVD program and I do not like it. I much prefer the legacy authoring mode. I like easily converting my markers into chapters, and the export options are easy to understand and make sense. I like to select DVD DL and it clearly tells my how much quality/how full the disc will be. Editing the menu is also easy, and I usually burn to .ISO.
This feature has been in legacy mode for the past few releases now and I fear they will eventually do away with it. +1 for keeping this.