It's not worth $10. I paid $5 and I wouldn't pay more than that.
The DLC is almost the opposite of the original game: no beautiful open world (just dark tunnels), not much collecting (just a few frescos, but they are well-hidden), and you can't return to previous areas (so things are missable) which kills the exploration aspect (especially if you're trying to do everything in 1 playthrough - ie time limit). Then there's the story aspect: Mitsuro is being kind. Can't say much for it other than its transparently trying to set up a sequel and really wrecks any impact the original story had.
EDIT: Apparently the sequel is already out: "Prince of Persia: The Fallen King" for the DS.
Last edited by Stork77; 07-30-2010 at 11:19 PM.