I however can not say it works perfectly on angles. I did A Civil Act that was 4.2gb to begin with but I wanted to strip out the fbi warnings. Fired up dvdstripper and stripped the warning and let it finished. When I viewed the movie, it was jumping from angle 1 to angle 2. It would show the english parts and then replay the same scene with spanish parts. This would only happen in the opening credits and ending credits. When playing in powerdvd, it showed angle 1/angle 2.
This was easily fixed by using ifoedit and stripping the spanish parts out manually.