IMHO it is impossible to convert a whole DVD to DivX format since the DivX specs are too limited. But we'll see...

Additionally there is not a single player out there or announced by any company that integrates the new DivX6 stuff. ratDVDs can be played everywhere (after conversion) - so I think that ratDVD is by far better...

BTW: You will never be able to convert DivX back to DVD because DivX makes their money by DISALLOWING you this and make you pay for the DivX function in the devices.