looks kinda snazzy, but first i think it would be worth (if you're slicing/dicing up your stock seat anyways) taking it to a local furniture repair shop and have the pan resculpted/apholstered. you might find some decent options locally for less $$$...
I have the Cee Bailey seat on my F650GS, with the heated option. Sweet seat, and the heat is great in weather like we have no in the NE. The memory foam is a great addition to the GS seat. I have a Sargent seat on my monster, and on another BMW (k100) and like them also. Have tried a couple of Corbins, but don't like the weight.
I noticed they use vicso-elastic foam in their seat (aka, memory foam). I work in the mattress industry and many manufacturers use this type of foam in their beds. They even make pillows out of them. Although it is a super comfortable foam (I have a memory foam pillow) I would be wary of a seat made out of this material as it is a heat sensitive foam. I would be worried about whether it can retain it's shape during a long ride or after sitting in the hot sun for a few hours. I see that motrid has one of their seats, though, so he might be able to give us better info on how the seat holds up!
Given my choice though, I would love a seat made out of latex! This is currently the "popular" foam in the mattress world. The elasticity of pure latex makes it super durable, but it could be expensive.