I just tried this out for my first iOS app. Very cool stuff. Your demo and on-boarding process is very smooth.
Just a little feedback - I was hesitant to sign up because I didn't want to love it and find out it is out of my range price-wise. When I saw your comment about it being free for indie developers, hobbyists, and open source, that's when I decided to sign up. My general impression with SaaS has often been that "No price listed" means "This is for enterprise, and you can't afford it." So you may want to consider saying something about your future pricing plans/tiers, even if you can't really nail it down right now.