This is the best working integration plugin out there. I really don't use the integration cause I disabled the wordpress registration so all the accounts will be on phpbb. :)
The problem is phpBB is not doing well nowadays, they're not updating and most of the plugins don't work or need a lot more work for it to work.
I really want you guys to make an integration for myBB or SMF forums. Also if ever, keep your widgets, I really love them. :D