Well I just had to do my tranny in the Bonnie, it bought knowing that is what it needed. It made it 87,000 miles, had no maintenance done to the car maybe oil changes, but that is debateable. (Well they did do the intake!)
I would suggest that if you have over 75,000 miles on it and it is working fine don't do it. The fluid is keeping the clutches from slipping. If it isn't working good do it maybe it fixes it maybe it dosen't. Either way you are going to replace it eventually. It is like the 4L60(700R4) in my vette, I had 120,000 miles on it and didn't know the maint. of the car. I got it with 100,000 even on it. I had the tranny flushed, becuase it wasn't hitting second right. I figured if the tranny flush worked I am in, if it didn't I had to do the tranny anyway, well it didn't but the Vette has one bad *** Tranny in it. My losey L98 went 12.82 at 112.02 mph last summer with mods of course.

AUKC, that is where they tapped into my line on my ssei. I like to watch. When they raised my truck into the air and removed pan, I thought they were just draining the pan and got a little excited. The manager explained how their flusher worked and took me out to see. I think the second type is better cause the pan is cleaned out, too.