That's a tough question to answer withour knowing more about your organization. If you're Ford Motor Company looking to replace your core business information system then I would say that you should not be looking at FM at all. On the other hand, if you are a small business (30 employees or less) or a small workgroup in a large company then maybe FM is for you.
If you have unique needs, FM might be right for you. If you want to be able to do deep customzations yourself, then FM may be the ticket. If you will have a very high transaction volume or if you need to be able to recover your data to within a seconds of a crash, then FM is porbably not for you.
If you provide more info on your organization we may be able to offer better advice.
-Striker