That's not true: "With no external dependency except the Twitter Bootstrap CSS styles, AngularStrap is lighter and faster than ever as it does leverage the power of ngAnimate from AngularJS 1.2+!". Please do read the docs.
But aside from that, I usually don't recommend it in part because I have heard that a lot of effort was expended in trying to reach out to mcgrea to put forth a joint community effort in maintaining a singular project, but mcgrea wasn't really interested in doing so, wanting to maintain total control in many respects. The codebase certainly suffered from that decision for a long time (and for a long time it wasn't well maintained either - not sure about its current state).
Have a look at the (dead) issue tracker if you're interested by the insights : https://github.com/angular-widgets/angular-bootstrap/issues?...