FRANKP One of the comments below states that this program is the only Mac program that imports MS Project files. That's not accurate. The application PMX also imports both mpp and mpx files.
I bought this program last year and tried to use it. Unfortunately, it has some severe limitations. If you're working on more than one project they all have to be in the same file. The terminology used is non-standard, so you can't use it in a group environment or use it to communicate with anyone else. You don't buy this program, you lease it on a subscription basis. When it came time to renew, I didn't bother. There are better Mac-based project management tools out there for the same price or cheaper.
(Version 2.1)