Quote Originally Posted by Zeta Kai View Post
It might be worth it for some, but I imagine that for the serious optimizers, this will be seen as a trap to take it so many times. The only real concern, for me, is the possibility of a rogue gaining a bunch of bonus feats (which for them are usually mutually-exclusive with their SA progression), so that they would have enough to burn on taking Improved Sneak Attack multiple times. As far as I can tell, though, it's not an easy thing for a rogue to do.
At 10th and above, a rogue is entitled to take a bonus feat in place of picking a special ability; those are independent of Sneak Attack progression and basically give the rogue an extra four feat slots should he want them. So...