TSLRCM tries to fix to the best of our abilities the issues The Sith Lords had due to being rushed. Containing a host of restored content and fixes many bugs left inside TSL giving you the most polished and best possible chance to get the full experience.
This improves the game 100% making it fully playable, and keeps you from banging you head into the walk, you should not play KoTor 2 without this mod. Many years, and a lot of effort make this game what it should have been, and not what broken, half done game we had to settle with.
Having played over 100 hours of Sith Lords restored content mod, in all 153 hours (Steam) give or take, I'd say I've had loads of fun.