SuSE Enterprise Server - Opinion Please

Hi, Anyone using SuSE Enterprise Server 9? I would be very glad to hear your opinion, both good and bad. BTW, I have few questions: 1) What proprietary software (from Novell or anyone else) is included in SuSE Enterprise Server 9? 2) What is the foundation of SuSE Enterprise Server 9? SuSE Linux 9.2 or 9.3? 3) Cost of the SuSE Enterprise Server 9 is for one server, or it can be installed on any number of servers, Like SuSE Linux itself? 4) Does it include Open Exchange? Thanks in advance. Andrei