I can tell you for a fact this isn't true. I have played the Velocity and ProV1 side by side for 2 months now. The Velocity is regularly 10 yards longer than the ProV, no matter the club. Even short par 3's I can see a 10 yard difference between the 2 balls. I don't care what the titleist robot data shows. In a real world application, the Velocity is more than 4 yards longer.
ive noticed the exact same thing. i played prov1's and v1x's early this past season and had specific clubs for certain holes... after switching to the velocity mid year im EASILY a club longer with the velocity's .. an 8 iron for me with the prov1 is about a 150-155yard club... after going to the velocity's i could hit the same 8 iron 165-170. i didnt notice much of a drop off in spin around the greens either. ive managed to save $20 a dozen by switching from the prov1's to the velocitys and increase my yardage... got a box of the double digit velocitys for christmas today actually. cant wait to pick up my new irons (Titleist MB712's) and get 2013 started!!!