Marc,
I installed one and moved my temp probe at the same time, so I can't accurately say what happened to the temperature. I didn't have a problem with the transmission temperature before or after. I don't think any temp change will be significant.
Besides an increased fluid capacity (1/2 quart with their normal pan and 4 quarts with their double deep pan), the biggest advantage to me is the nice no-leak drain plug built in. This makes fluid changes a whole lot more pleasant.
On top of that they sure look great, have a lifetime warranty, and they're still made in the USA!
John L.