Depending on your playstyle, taking ambush snipe and crippling shot together could be ok. Maybe it is worth it just to harass like you said, don't really know. But along the same line as some of the comments are saying, I usually get one or the other. My burst build has two variations, one using ambush and double fake at 16. The other using increased snipe range and crippling shot, so there is more synergy with whatever skill I build towards opening with. Crippling shot is probably better for...