I agree with previous feedback suggesting that this is a very counter-intuitive user interface. I really dislike it for that. And it's a little bit buggy. And it's not cheap.

But despite this, I do think this is the best of the bunch. The facilities for automatic scheduling and the flexibility of mapping resources onto tasks are great, and I haven't seen the like in FastTrack, PMX or any of the others I keep trying in the hope of finding something similarly powerful.

Some key things I want from a tool like this is that it will stop me from allocating a task to somebody who isn't available, let me enter different working times and vacations for different people, attempt to schedule things automatically for me, and allow me some flexibility in allocating tasks to resources ('This could be done by either John or Bob')

I haven't found anything else on the Mac that will do this.