First of all,it will not conflict with RecordNowMax.
The right version is excellent for Dvd-9 (dual layer).The quality is about the best of all the current software.Only CCE does a better job IMHO,see Chickenman's tutorials for that.
The downside is the transcoding is a lot slower than Dvd2one and the others.
Here is a description of the different versions.The early "6" versions weren't very good.You need a ripper,as it does not remove protection on the dvd's.Hope that helps.