Do you see any server side performance hit?
How many users do you have?
Are you using the webUI?
How many users have 'Instant Notification' enabled?

We have immediate need to provide an enterprise IM solution. Turning on this beta feture would be our preferred choice.

But... The web client is not usable. 'Instant Notification' 'enabled' is only faster than 'Instant Notification' 'disabled'

Pidgin seems slick and it is instant. Still unknown what performance hit to expect. Pidgin requires configuration per user, the webUI does not...

Plus you can not search the forum for 'IM'

We have 3000 users across 2 servers. 2ghz quad core with 8GB RAM