o sorry. that's of course if you dont hit your set. i guess there are three scenarios 99 will play well.
1. you hit ur set.
2. rag flops (uncoordinated)
3. you hit ur straight somehow. (not the sucker kind)

now even if the rag flops, the pot's so big that the overcards will not be chased off the pot (assuming the opponent is not super weak.) on top of that you will occasionally be up against bigger PP- probably more often that you'd like to be. i mean i agree it plays sorta well, but i def wouldn't feel too comfortable even after a favorable (nonset) flop. doesn't mean im not betting or raising though. i'm bettin/raising until you tell me otherwise.