Im split 50/50, from a personal point of view I think its a pain in the *** once you filled out all your info on the shopping site you faced with yet another form to fill out (which never loads that fast). If your like me an use super complicated passwords it takes another minute or so. I can certainly see why people abandon the cart when faced with this, my family are constantly forgeting there VbV password!
From a professional point of view I think its a good thing and is on my list to recoment to the board when/if a new site build get the go ahead. We dont get too many fraudulent orders but its always better to be safe then sorry.
I would be interested if ther are any comparable stats.