But from what I've been reading about the problems in the firmware source code, I'm not sure how much ASUS does code reviews, new feature testing, and regression testing when they make changes.
Seeing how long this build 151 has been in beta (people even call it an official release, tho they didn't notice that the only place Asus has that file available so far is in an FTP folder called "FOR_TESTING"), I thing it's a good sign that Asus are serious about getting this firmware in better shape before making the next official release.