Forum: RForum Rails Forum Recommendation

Just wondering which Rails-based forum you would recommend.  I really
like the speed and features of RForum but the fact that it's based on
Rails 1.6 is a bit of a worry - primarily from the perspective of
security.

But that said, I don't think any of the others (El Dorado or Altered
Beast) currently have the same kind of feature set.

A little advice would help a lot!  Thanks!

Best wishes
Mohit.