I feel in my own experience that road tuning has its own benefit's over dyno tuning but I will say that having 4 or 5 hours on a dyno to do the wot runs is alot safer then on the road.
I second paul at Hunter Thomas.
I have done many road tunes and never seen what output they have on a dyno but just from the seat in the pants feel, well I can say that it is impressive with positive response's from the owner's of the vehicle's.
One day I will get to know how to do dyno work one day lol