MacX Free DVD to MP4 Converter for Mac is a nice DVD ripper. It is free, so I won't complain much about its flaws, and I will concentrate on the good things it has to offer.
The first thing I want to mention in this regard is that it works very well. It handled two DVD movies I usually use to test this type of apps just fine. Second, although it has limited format support, it supports the most popular ones. This DVD ripper can encode files using the H.264, MPEG-4, FLV and MP3 codecs. Those formats can be played on pretty much any modern computer, and on a variety of devices, like the iPod, iPhone, iPad, Blackberry phones, gaming consoles, etc. Although the graphical user interface isn't the best-looking one you have seen, it is simple and to-the-point. It has some on-screen help that guides you through the process and the conversion settings, located at the bottom of the screen, are very easy to understand. There aren't any conversion profiles, but you can change the settings manually to achieve good results.
So, the bottom line is that this is a free DVD ripper that works well and it is easy to use. It has limited format support, but it is free, so I can't really complain.