This is the kind of thing that can go one of two ways. Either it will work, or it won't.
The material for the seat does not always determine if it will be comfortable. I've seen a triple cushioned seat that would break your tailbone if you rode more than five miles on it; I've also seen a seat made of thick, hard resin-like material that felt like a pillow. Rather than the material of the seat, it all boils down to how the seat molds to your backside. If it is the right shape and the in the right position, you could have a section of 2x4 as a seat and it would probably be more comfortable than a cushioned seat that isn't the right shape/position.
Sorry to get a little off topic with that one. Anyways,as the first answer stated, I would be concerned about the integrity of the wood on the seat. Is the glue weather proof? Will the sealant fail due to the moisture from your rear? Will the wood flex? What if you chip the seat, will you get slivers?
I would suggest doing more research on the saddle, and most of all, see if you can find any product reviews. Good luck!