clonedvd is a transcoder therefore it will remove the original layer break. when you do to burn it will calulate the optimal position for a layer break and re-insert it.
99% of people have no problem with this method, but since the layer break is up to the program and not where it was in the original it's possible (however unlikely) that it will be pu tin a "bad" spot and cause skipping or freezing.
i don't use clonecd so hopefully someone will come by with clarification as to that method.
my DL burning strategy:
1) use only VERBATIM discs
2) be sure drive firmware is up to date
3) rip the disc in "ISO>READ" mode in dvd Decrypter with anydvd running in the background.
4) this results in an ISO and a MDS file.
5) open up ImgBurn and load the MDS file. Set burn speed (I use 2.4x) and burn as normal
this MDS file retains information from the original disc and "tells" the burning program where to put the layer break.
both DVD Decrypter and ImgBurn are free programs and CloneCD has a free trial so go ahead and give it a try and make up your mind for yourself. basically it operates on the same principle...keeping the layer break where it was on the original.
that being said, there are PLENTY of people that have no problem using CloneDVD2 to burn DL movies...