I'm one of those people who will collect every single thing that there is relating to Red Dwarf (or Star Wars, Harry Potter, etc). And this was my newest addition.
I should start by saying that in terms of comedy quality, the actual story part of it isn't Red Dwarf material. It's written and directed by Danny John-Jules so you won't find any Grant Naylor sort of jokes in it. But in terms of entertainment and collectors, it is a must for any Red Dwarf fan. You get appearances by the cast of RD during the film clip (Queeg and Elvis from "Meltdown" included which made me giggle happily to myself) and at the end of it all, a eight or so minute "Making of" feature which delves into the slightly mad nature of John-Jules, Craig Charles & Robert Llewellyn. All in all, a good purchase for a collector or huge fan but I wouldn't recommend it to those who are not so big fans. I enjoyed it, however.