IMO, TSLRCM doesn't add anything important and would suggest playing without it, if only to finish the game sooner. Personally, it only managed to make me more frustrated at the bad writing, railroading and forced situations; since it adds more of those, rather than some actual choice and any plot hole plugging. TSL makes the assumption that the player will always want to be the goody-two-shoes or the complete asshole, reflected by the lack of other/more sensible choices(the lack of choices in general is big in this one). Which is ironic, since they wanted a more "grey" Star Wars with this game. Oh and the companions. Let's just say they don't know the word "no". Like gizmo said, there are some good moments here and there, but overall it's shit.