What do you mean exactly by "decoder"? If you are referring to Shrink's decrypting abilities, ie being able to break the copy protection found on commercial dvd's, then I'd say it has fallen behind the times. DVDDecrypter is more capable in this regard, and is still being updated.
If you are talking about Shrink's abilities as a transcoder, reducing the size of the files to fit a dvd-r, then I'd say its an excellent program, especially considering its cost. There are some other good options out there though. DVDRebuilder has the option to use the transcoder ReJig, and it is very well regarded. And it is also free.