Several day ago, I saw a on then I had a free trial and found the image and sound quality are both quite good. It can easily rip DVD to almost popular video formats, such as MP4, H.264, AVI, WMV, FLV, MKV, MPEG-1, MPEG-2, 3GP, 3GPP, VOB, DivX, MOV, RM, RMVB, DPG, etc, it can even rip DVD to HD video.
And it's easy to use, just few clicks. If you don't know how to use, you can visit this article, which tell you how to
to video/audio files.
And if you are mac users, you can have also have a try this .