It's pretty super cool, while the library is a little limited you can either build your own device with drag and drop & hookups to add to a 'shopping list' or take it a little further with doing it at a schematic or pcb level to build custom parts. It even has a basic arduino compiler/serial monitor!
Aside from the downside of not having the ability to create custom parts where something you need isnt in the library yet, this is pretty damn cool. Ill have to use it in future.
Snipe for eBay