User Manager Testing

Hi:

I had a new project, and I thinking to use User-Manager, but i need to know how reliable is it.

have you got any Traffic Generator for User-Manager?
I need to know how many users can UM handle, without complications. Have you got any statistics of that?
I read that with a Level 6, the amount of users that can be logged it at the same time is unlimited, but how much users can UM handle in fact?


Thank You.

It would be great if anyone can share the information about RADIUS servers testing tool.