I have considered the Thumbhole too. I looked at the Thumbhole stock and compared it to the standard composite. The basic idea of the thumbhole is to provide a pistol type grip. The standard stock provides the same position, unless you modify the thumbhole.
I fired a thumbhole several times and to me, it didn't do anything shooting wise that I didn't already have.
It looks cool though. Take 3 asprin, go lay down and the urge may pass.
I still want a fancy wood stock and the above did not work for me.
Harold Clark