I have a hosting client (which is now on vertex) which now uses Invision. It's very nice. It is free - but they have "paid" versions which come with support etc.....
They call it a free trial - but it's pretty much fully functional:
[]You are about to download the free trial version of Invision Power Board. Although this version is fully functional you must understand the limits of the free trial offer:
* Absolutely no technical support, including installation assistance, is provided for the free trial download. Technical support is provided for those purchasing the software by email, live chat, and telephone 365 days a year.
* Your forum, although perfectly functional, will display a small notice at the bottom of the page that it is a free trial download.
* Certain advanced features of the software (subscriptions manager, spell checker, chat service, etc.) may not be available in the free trial option as these require additional modules to operate that are only available to licence holders.
* You can purchase a license to Invision Power Board at any time to download addons and request support and the upgrade from the free trial version is quick and easy. [/]
But I think they are trying to ease away from the free model and get people to pay for it.
Threads is a better value in my opinion.

I'll have to consider if I want to do free new threads installs to hosting customers.

Might be better than seeing them go to PHPbb or Invision.
