I just had it put in. It's a used tranny with about 100,000 miles on it. I got it for $100.
Works a lot better than the previous one though. It too had some hesitation even after a rebuild.
My old one has a fairly new valve body in it but I figure it might be compromised after 3rd and 4th gear went out. The fluid was black almost. I was thinking of puting it, the valve body that is, into the new one to see what it would do. Also doing the accum. upgrades while at it.