I give mgtwitterengine credit for being there (was there for me in a snap once) and being there first for cocoa devs to drop in, but there are some nasties to it. It's async callback/delegate pattern is odd (try supporting multiple accounts with it and you understand quickly that you don't where the data is coming from because there is no handle back to the account). Twitter's api isn't overly complicated so it's easy enough to roll your own API wrapper, which is what did in my own project.
Zac Bowling
@zbowling
It also was written before Objective-C 2.0 ;-)
Zac Bowling
@zbowling