g.b5902531wrote a review of Nike Snowboarding Vapen Snowboard Boot - Men's on December 31, 2012
Just used these on the first trip of the year and absolutely loved them, zero complaints. As some others have pointed out they are a little bit soft yet still provide very good response. These would be a great boot if you stick mostly to the park. Being as I don't spend a lot of time in the park I probably should have gotten something a tad more stiff, but oh well.
As for sizing they were true to fit for me. I wear a 9.5 in most Nike SB shoes and a 9 in most "normal" Nike shoes. I tried these on in a 9 and they were just a tad too tight, 9.5 fit perfectly.
The Vapens are extremely comfortable and keep my feet plenty warm. Comfort has not been an issue to this point yet. I tried on a lot of boots in the $150-200ish price range and I doubt you'll find something more comfortable than the Vapen.