How many using an A500 overdrive ?

How many have installed an A500/42h overdrive transmission ? Why did you choose it over the A518/46h overdrive ?
How has it held up for the way that you use your car ? Would you choose the A500/42h again/ or upgrade to the larger A518/46h ?
Trying to poll those that have been there/done that. To help me make a informed choice. Thanks...please ad any comments.
My vehicle is a 1964 Dodge A100. With a 318 mostly stock. DD , cruiser.

I couldn't ever go back to a standard 3 speed (904)
It fit in the car with very little underside mods unlike the A518 and I am going on 3-4? years with mine.
It was put in used out of a front end wrecked 95 Dakota, has a stage 2 Transgo kit installed, with the OE 1,800 stall converter with OD and lockup completely automatically shifted via the governor hydraulic pressures.

My car is a daily driver with freeway gears (2.73) and gets 25mpg at 80mph doing 2,100rpms.
Motor is a mild built 5.9 Magnum with a torque cam, Edelbrock intake and carb, Hughes valve gear on stock 1.6 rockers with 1 5/8 tube headers.

Like I said, I'll never go back.

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