I have just purchased Invision Power Board and Ryan from invision has perfected the UBB.threads importer for me.
It has been a bless to work with a real community software for a change.
As I am now using IPB on my test forums, I realise how far behind UBB.Threads actually is.
The never ending promises for a version 8 and lack of communication has pushed me towards IPB and I'm happy to say that at the release of version 3.2.0 we will convert.
Cheers,
Michel