This is an excellent tool for iOS developers. The time saved creating icons, buttons, images and mock-ups is well worth the price. Bézier curves can be difficult to work with for first time users, but the excellent documentation, videos and examples will get you up and running quickly. My binary is much smaller now and I don’t have to worry about @2x, @3x, or other size variations when working with static images.
The support team is very responsive. I had an issue with a few of my images and received detailed steps to fix everything.
I’m still an amateur when working with graphics, but this tool save me many hours of work. The end results look great.