And whats your consideration now? As in going back to vb..
Meaning why am I thinking of going back to vB? Well, let me see if I can put that answer into words.
First, I think xF is a superior product to vB, it's clean and coded from scratch so it doesn't have the years of old/bad code any piece of software gets (vB in this case).
That being said, there are some issues I have with xF overall.
First, while the mod support is getting better, it's not what vB is and the entry into xF MVC coding is more difficult for most people. So, there are fewer mods and IMO in general, less robust mods than you can get with vB currently. Doesn't mean they won't exist or there aren't any, but in general, that's my feeling.
xF has issues. First, the lawsuit by IB. I think the lawsuit is a pile of crap and and I hope IB loses in a big way. But, it's doing what they want it to do, hurt xF. The authors of xF are spending more time battling the lawsuit than working on xF (at least it seems to be the case to me). The way the xF site is run, seems neglectful to me and just doesn't have the community I like to see behind it to run itself (again, IMO, I'm waiting for someone to freak out and quote me or something... hehe).
Also, the authors don't really even post on their own forums anymore and there's no longer a feeling of longevity for me.
If I do switch, I'll retain my xF license (I just renewed it a couple months ago just to show support to them) and I wouldn't have a problem going back to it if/when things settle down for them and they can really get back to business. I still support xF and want to see them succeed, and by that I mean, compete with vB and IPB, making all of them give us better software in the end.
As to vB5... whatever. I won't hold my breath on that one. I mean, it'll get released, but we saw so many things that were supposed to happen 3 years ago in vB4 that are just now getting done.... I dunno, I'll wait and see. I'd like to say "I was wrong, they kicked ass for this version of vB!" and hope I can say that when it's released. I'm not entirely sure that vB is going a direction I want or like, a crapton of 3'rd party integration and little in the way of new and innovative creations of their own. The 3'rd party integration is good, but not at the expense of new vB features (which is how I see it anyway).