how accurate do you think the estimated yardage is on the vector?
Pretty damn good imo. I remember when i was swinging a bit slower my "best drives" were in the 275-290 range (currently my best drives are in the 290-305 range).
When i was getting fitted (back then) the Vectory accurately recorded one of my "best drives." Something like:
108mph swing speed
don't remember ball speed
i think a 13.5-14.3* launch angle
something like 2750 or 2800rpm of spin
carry was 275
roll was calculated at 14 yards
total yardage was 289 which was a "best drive" back then.
However the vector was setup NUETRAL. They can be "tricked up" a bit. As long as the person setting it up knows what they are doing and are placing it correctly they are really great.