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.
Huh, that must've changed recently then. It certainly was not true for a long time.
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).
That's not true either, I (mgcrea) was more than happy to merge efforts with the UI team. We started a joint repository with the UI-team and I did commit a lot (time, work, PRs) there. Unfortunately the UI team did not have the time (or will) to debate and work on it at the time, several months passed, I ended up quite alone there and finally we decided to part our ways. UI team got back to work on their existing codebase, and the work I had made there (several PRs) became the initial seed for the AngularStrap v2 full rewrite.
"have heard"? This sounds like FUD to me.
For the record, I am using Angular UI bootstrap but am thinking of switching mainly because
a) It doesn't look like it is being actively maintained
b) The animation used in AngularStrap demos make it look quite slick
c) The port looks straightforward
