The more i browse around, the more I like this software! and definitely see a use for it with a website i've been wanting to get back up that used to run vB3. I will definitely be interested in xF. I'm currently an IPB user and love IPB but XF can definitely become my 2nd favorite platform. Especially if it's affordable!
I still have many licenses for VB, but left the VB's site a while ago when I bought IPB to play with. Got tired of talking like a broken record on VB about needed enhancements and begging for vb3 features to come back. And just plain tired of not seeing any movement toward new innovative features. I rarely visit the VB site now. ATM I'm quite happy with IPB and it's direction. At least I know what's going on and have things to look forward to with IPB.
I'll admit that I felt like a trader to VB, at first. I'm sure many may feel that way when looking here. Don't! Play with all the software, have fun, and choose what works best for you.
I will certainly keep an eye on XenForo. Feels very smooth and has some awesome looking features for end users, so far. I will probably get a license when it's released, to help support development and to play with. Good luck guys ;-)