Heat-sink trans coolers. Who's got them, and how do you like them?

Looks nice, but how well does it cool? Without a cross section of the cooler, you don't really know whats inside. It could be just a 2 pass tube and fin style cooler in a really nice casting. I'm not saying it's not a good cooler, just that you really don't know how its made internally. Find out what the GVW rating of this cooler is. Ask if there is a cross section view of it available. If you're only going to use this cooler, IMHO I don't think its adequate.
Go to www.trucool.com and they explain to you how coolers (transmission or otherwise) work. The cast cooler by the way is made by Derale.