I agree the Desert Fox unit is nice. Their is still a flaw with that cooler, your running through the stock radiator. If I was going to spend $250 on transmission cooler, I'd run a full stand alone trans cooler. Why spend $250 when theirs been numerous people that have their radiators core leak water into the trans fluid and their goes your transmission. Or at the very least get rid of the flexible lines and run hard lines (stainless, aluminum, steel) are all better alternatives and can be done for cheap.
It all comes down to price. That Desert fox unit is over priced for what it offers.