I've been using this with 2 other team members to build our app.
One of the biggest problems we run into is code collisions: We even ask each other are you working on a certain page, but if they say no and you finish your code, test it, etc. Then later another team member has a cached version of the older code, even if they did not modify it, but they did a save on other code it save the older code on top of your newer code. We really find this feature annoying.
Code management is a big problem, but the old builder did handle this it appeared.
Testing can be an issue with a team, the builder always saves the code before running in simulator. It would be nice if would not save the code into the central code repository, so one persons bugs do not affect another persons work and test.
Looking forward to your stories