Rob, I am with RayChez that I might tend to stick with the Dextron III since if it ain't broke...
I was "thinking" about the Transynd but it is pricey and the Dextron III is cheap (relatively).
I will most likely do my own since it would cost me around $30 in fuel just to get it to the shop and back...and I like doing my own maintenance.
O.K., maybe "like" is too strong a word here...