As long as you are careful you should have no problems - although I am not using them at the moment - I have run with 700+ groups in the past. <img src="https://www.ubbcentral.com/boards/images/graemlins/laugh.gif" alt="" />
But as Josh says - there is a limit to the number of groups that somone can belong to. (I think the field limit is 255 - so 125 would be the maximum)
I can't remember the check you need to take out - but if you have a method for searching the code look for 99 and you will soon find it.
When I find the code, I will post it.
