[Wlug] Using SAMBA as a PDC

Hi all, At work, there are several workstations and servers (about 15) running Win2k, Win2k Server, and WinXP. I also have a server running SuSE 9.1 that has Samba 3.0.4 installed. I'm wondering if anyone out there has used Samba as a Primary Domain Controller in a Windows environment? Can Samba be used as a BDC (Backup Domain Controller)? What are the pit-falls? ... Any "war" stories? ... Advice?? Thanks, -Chuck