If you have buddies that create lots of difficult terrain, there's a feat that gives you CA while your target is in it.
There's another one that gives you CA while you have concealment against your target.
Finally there's one which gives you CA against any target that has no creature other than you adjacent.
The first is definately situational, but there are certainly party make-ups that would get a good bonus from it.The first is situational, the second is highly dependent on equipment (Armor of Dark Deeds makes it almost guarantee permanent CA), and the third is pure gold all by itself.
I started a thread a few weeks back about whether the third one (Cunning Stalker) is melee-only or can be used at range. Opinion was all over the place, but if it CAN be used at range, it is a pure improvement (for the cost of a feat) over the Thief's Ambush Trick. If only usable in melee, it still enables one to get CA in many cases where it would not otherwise be possible, or where one COULD use Ambush Trick but would have to take an OA for moving.
For starters, ambush trick lets you have some of your allies next to the target (getting a completely isolated foe is actually not that easy).
Yes, but if you have an ally next to the target, you can get the same result (CA) from Tactical Trick, which has fewer restrictions and a better movement clause. In other words, if you have Cunning Stalker and Tactical Trick, Ambush Trick never gives you any benefit.
And if you don't, then it does. I mean seriously, if we're going down the path of "this rogue trick is bad" then what is the point of the one that gives +Cha to damage if you don't have CA? Is it really intended to be combined with obscure dragon mag feats before it's any good?
If .....
Finally there's one which gives you CA against any target that has no creature other than you adjacent.
.....melee.