I too have the Mag-Hytec dd trans pan. Its a really nice pan. It has a drain plug, and has fins which aid in cooling, and it also adds 4 qts to the fluid capacity of the trans. The transmission pan comes with a nice gasket to use, and it has a 2" or so drop plate for the transmission filter.
In another 30,000 miles or so, when it comes time to change my axle fluids again, i'm planning on getting the Mag-Hytec differential covers and installing them on my truck. They have great products, and i'd recommend them to anyone!
Tim