I did this process four months ago while testing various ways of getting a dvd compilation on blu ray discs...here is my write up of the process:
[I]Making the blu ray version in the program is not hard at all, once you learn the necessary steps. You set the program to make a blu ray, bring in the first dvd movie, set up a folder to put it in and have the program make a new blu ray video. When it has finished processing the first movie, you back up, refresh the main window and bring in the next movie. This time you add the movie to your existing blu ray structure by making the target the index.bdmv file within the BDMV folder of the blu ray you just made. Continue this till you've got all of them imported.
The major flaw? You have no menu. There is no easy way to select each movie. The original chapter points are kept, so you can skip ahead within each movie, but once you get to the last chapter point in the movie you have no way to get to the end of it quickly. Even fast forward was limited to 2x speed in my player.
[/I]I didn't have any problems mentioned by chroniclesofmnkd though.