I am working now for over one year with Merlin and in this time it has been developed to the major tool for projects!

It includes (almost) all needed functions for a project manager's work and present it in a very usable and pretty interface. Each single function makes clear to me, they have thought about it - not from a developers perspective - but with their project managers eyes. And I think this is one of the (or maby the biggest) factor of success: These guys are project managers!

Of course it is not bug free - I don't know any application which is bug free - but the responsiveness of the support team, and the performance of the developers are beating any other application in that field.

Long time ago Merlin was treated as an insider tip. Now I have to say: Merlin is the standard on Mac OS X.

Standard disclaimer: I am not beeing paid for writing this!