Pixate is pretty good but it's a huge jumbled mess once you have more than a few layers.
Ouch - what would you say it's good at? How complex of a UI can you create in Pixate?
Simple animations can be made very quickly, just drag&drop an interaction and an animation. You can make the example in the article in 3-5 minutes but if you want to see a prototype very identical to real app (all views, tabs, pages etc) then difficulty increases exponentially.
A couple of days ago, I made a messaging app prototype with all contact lists, tabs, scrollable content and filter. It took so much time to add a new view after 5 - 6 views. It's better to split them into different projects and I'll do it so in my next projects.
Thats the beauty of it, keep a lot of things flat and concentrate on the interaction of a few objects. As the article suggests, starting out with flat, plain objects is the best way to go.
We know the sheer number of layers in a single prototype can get overwhelming if you're building a longer flow - this is something we're working on right now. We've got some pretty cool stuff in the works.
Awesome, looking forward to it.
I love it and it is very useful at work. It is a very young software and I hope it will grow up.