In general, the software is a joy to work with. I'm still using a test site at the moment, but am looking forward to launching and letting my members take it for a spin. My previous vBulletin template was highly customized with CSS (unrecognizable as vB for the most part), so considering how close I was able to make it look already in XF, I think my members will feel right at home from the getgo.
In just a few days or so, you'll have another 1,000,000+ board using your software. Night and day difference between XF and vB. I'm amazed, really. Bravo!