Dartfish -- has anyone used it for their bike fitting?

One of the local tri coaches in my area will soon be offering Dartfish for bike fittings and form analysis.  I am planning on buying my first tri bike this fall and was wondering if this method was better than the standard approach.  I bought a custom road bike several years ago using the standard method and it fits like a glove.  Of course, I bought the road bike from the people who fit me.  This probably would not be the case if I use Dartfish.  Will a bike fitter trust someone else's measurements?

Any thoughts would be great.  Thanks.

Suzy