I first saw the saddle idea about a decade ago while I was in college. I looked it up and it was way to expensive for my taste so I was stupid and tried hunting in my rock climbing saddle. I figured if I can hang in it while belaying durring big wall climbs it should be ok. Not so true, the first hour was alright, although not moving in that harness was difficult. After an hour though it really got to be not enjoyable. That was the end of hunting in the harness.
Then about 3 years ago I wanted to give it a try again because I started traveling back to Wisconsin to hunt with my family over Thanksgiving. By this time the saddle was not being sold anymore and I didn't care for the other options. To make a long story short I ran across a Boatswain's Chair at West Marine. I know it's not marketed for hunting (more for sailing) but decided to give it a try. I have to say this is great. It was cheaper and more comfortable. It is a bit heavy though due to the plywood in the seat. You can remove it along with the foam pad but I don't because the rigid seat I think makes it more comfortable.
In addition to this I use a Petzl Gri-Gri belay device because it is easy to use and is self locking. I also use 2 slings from REI with a repel ring, 2 locking carabiners and a small ammount of static line to finish it all off.
Boatswain's Chair:
http://www.westmarine.com/mast-climbing ... ab-details
Gri-Gri:
http://www.rei.com/product/809263/petzl ... lay-device