In 1973, An enthusiast magazine (I'll have to check my Brooklands book for which one) road tested an automatic bus. It only lost about a half second in the quarter mile to the manual. They were impressed with its smoothness and efficent power delivery. They also took it on an off-road hill to test its climbing abilities. It beat the stickshift and nearly made it to the top, past the point of most cars. The only two-wheel drive car to make it to the top? A Thing!
So, good transmissions when new, durable enough to still be around, but, yes, more expensive to work on if broke, so be sure this is a well-mantained box first, then drive it without fear!