Crash! No use at all! I just looking for a conversion app. Now i should keep Looking!!

I want to convert my discs to mp4 so i can watch on my pad. It is terrible for me when I use this app. It didnt even work once for me and constantly showed me a dialog said quit with unexpected reason. And after a while, it crashed and closed. I tried several discs, and with no luck. Would someone recommend me another conversion tool which really works? I searched and tried many apps, but i dont found a great one until now. Thanks if you can advise.
Just avoid this one, dont buy! I want my money back so i can purchase another one!!!

Ckdolli Roewn about DVD Ripper-Aimersoft