I've been using this for a couple of months now and can confirm it makes managing a complex WordPress deployment much simpler. It is used not only by Knewton's developers, but also their non- (or less-) technical staff.
Congrats for getting this open sourced and available to the public!
This looks pretty fantastic. I know we're going to be building a couple of WordPress sites for clients soon, and this looks to be an excellent way to manage development and deployment. I'll definitely be playing around with this in the near future.