We've been using Max for 7 or 8 years now and we're very happy with it, and the service from CABC. Both can be highly recommended.
In particular, Max is very stable and we have never lost data in 8 years. (Had some fun with installation, but that's another story.)
The real issue is how well the various packages meet your own business needs. We evaluated these products 8 years ago, and so the reasons for our elimination of Act and Goldmine may not be valid any longer. At that time, ACT was a single-user only program, and its user-definable field capability was very limited.
Similarly, GoldMine used one record per contact, and we have many different customers at the same address we greatly preferred the way Max lets you have as many customers as you want at a given organization, and even give them different addresses (like HOME or second-office addresses).
That, and the sheer flexibility of the product, especially in user-defined fields, were what clinched it for us. Of course, you need to check this against the 2003 capabilities of the other products.
One thing we liked about GoldMine that's still not in Max is the ability to automatically send letters and e-mails on a schedule. Max will remind you to do it: I'd prefer for Max to get on and do it for me. Maybe in version 8!
Pasta