Take a look at the standard definition transcoder DVD Shrink, why is it still so VERY POPULAR after the last release many years ago, because of its unique design, easy to use, and extremely fast transcoder, still used around the world.
Build a high definition transcoder like DVD Shrink and you are sure to have a winning product in much demand.
I have always personally found DVD Shrink PQ to be terrable quality thats the reason that I always used DVD Decrypter & DVD Rebuilder PRO transcoding may be faster but you cannot argue with the quality of a full re-encode.
BD Rebuilder is working great for me on full disc encodes I don't really get any fails anymore unless I start messing with the finished files to try and obtain lossless audio but I have only had semi sucessfull results doing this with both TrueHD & DTS-HD