I hope mine lasts as long as your guys'

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I need a suggestion regarding my tranny. I have about 52k and have owned the car since about 36k. I do not believe a transmission flush was ever done on the vehicle. However, I have been doing the 4qt drain and fill method quite regularly (in fact, a bit too often; I'm just paranoid). Anyways, I assume that the tranny needs a flush to get rid of everything built up in the TC, which isn't dealt w/in the drain and fill method. I have done the drain and fill method about 8 times thus far on the 16k miles that I have owned the car. Should I go for a complete flush? Also, what are the chances of the tranny going with a the complete flush, as I have heard horror stories about this? I do realize, that with the changing of the fluids by the fill/drain method, it is quite unlikely for the tranny to go in the flush, but again I'm a paranoid guy. If anyone can offer some advice or suggestions, that'd be great. Thanks.