I LOVE the Disk World series and was very much looking forward to this film. It's a great adaptation of the first two books AND there's an interview with Terry at the beginning, which is almost worth the price of the dvd on its own. The man is seriously funny.
I know that Terry endorsed the choice of David Jason as Rincewind, but I'm sorry, he's just not Rincewind. He gave it his best shot, and David is a national treasure and a great actor - but he just wasn't the best man for the job in this case.
Sean Astin did his best as Twoflower, the Tourist.
The Luggage was excellent, but didn't feature as much as I would have liked.
It was great to see Tim Curry brought out of seclusion to play Trymon, the baddie and all the other wizards were suitably kooky as well.
The Librarian/Orangutan was a leetle bit artificial ... it was clearly a man in a mon (oops!) ape suit, which was rather a shame, but you can't have everything, I guess, and maybe there wasn't an orangutan available for filming.
The scenery was great, the humour was there in abundance and I highly recommend this to all Pratchett fans.