Like I said in the original post, if YOU like the features and effects it brings to the limited number of games it impacts, then it's a good idea, I have a friend who LOVES the effects on UT3, for others though it's not a big deal, so it's not easy for anyone to guide you because some games like GRAWI/II and UT3 can give SOME people great experiences, but only you know if it's worth it to you.
For me the impact on UT3 was artificial and was more like an interesting Tech Demo that I called "UT3 with Debris".
I recommend you check the you tube video of the effects in action (not the other technical and experimental stuff) and see if that will enhance your experience enough to be worth it. Other people will just tell you their opinion of that experience.