[Samba] Samba with a lot of users (1500-2000) : experience ? hints ? references ?

[Denis BUCHER]

Dear all,

I have installed many PC infrastructures with Samba and Windows roaming 
profiles working successfully and fast with installations of around 100 
users.

But now, a customer of mine is asking if this is possible for around 
1500 users. Of course I know it is possible, but I would like to know if 
some people here already did such an installation, if it requires more 
than one Samba server, if there are some limitations, and what could be 
(will be) the difficulties

If you know some web pages about success stories, examples, hints, 
whatever, I would also be interested...

Thanks a lot in advance for any help !

Denis