Agree w/ Ethical Redneck.
Forget the saddle, use Guido's Web. I have the web and was so glad to ditch the tree saddle.
with the web, you are pushed away from the tree so no knee pads necessary, it is sooooo comfy you can sleep in it!
Now, shooting from these things takes practice, and in my opinion you should do what Eberhard says and get HIGH in the tree. Now I don't like that part. If possible, get in a tree that you are very concealed, otherwise for some reason, you have to make sure you get up there a bit.
I hunt spooky deer, but you have to get out of their sight which takes practice.
Also, set up so your shots are to the dominant side of the tree. It is too difficult to shoot to your off side so don't even attempt it in my opinion.
Getting higher also allows you to move a bit more for the shot if needed without being seen. Again, I think they are great in the right situation.
Snag has some tips that really helped me, but can't remember the topic