I have seen a lot of discussion about the benefits of a TransGo shift kit. Some say it will greatly extend the life of an automatic transmission. Anyone here have any experience with one, or know anything about it? Are there any downsides?

Here's some links:

http://www.apsprecision.com/ShiftKit.html
http://www.txchange.com/transgo.htm
http://www.dodgetalk.com/forums/show...d=1#post412642