... I've ever used on a Mac.

I just developped a small electronic panel using multiple layer, ...
It just does exactly what I expect.

Ease Of Use: 4 stars, because there are sometimes too many windows on my display. Layer selection interface could also improved a little bit.
Features: 4 stars, because there is some minor interface related stuff, which could be improved.
Quality/Stability: 5 stars. Never had any crash in the current release - and I work a lot with it!
Price: 5 stars!

Thanks for this software!