Back in the late 80's, I ran into some little old grizzled dude, at the mart. We were both buying all of the Thunderhead 125's we could get at $5 a box from the Wal-Mart year end clearance aisle. I actually split up the available boxes between us, so we could both buy the same amount. The dude asked me where I hunted, then proceeded to tell me that he hunted public, exclusively. He told me to go get this particular Bowhunting magazine, where I would find an add in there for an Anderson Tree sling. He informed me that, once I bought one, it would forever change the way I hunt. I bought the magazine. then once I got home I ordered the sling and a pair of Buckingham climbing hooks and away I went. Back then, I could hunt two complete days before the arches of my feet and the insides of both knees were so sore, that I would need a day or so break. A few yrs later, I met a dude at the Whitetail Classic who was selling an "improved" Anderson, called The Bulldog. It had an aluminum frame for the seat to attach to, a back rest strap, and a sliding bar between your legs, as a standoff, against the tree, instead of knee pads. It is very comfortable and addressed the sore knee problem of the Anderson. The spurs are mostly retired, but as for the Bulldog, I have used it ever yr. since. I never saw the old boy again, but if I ever had, I'd a shook his hand.