I have used a lot of safety belts, harnesses, and one vest in the last 16 years, always trading up to a higher degree of safety. Yesterday my Rescue One CDS II was delivered. I am sooooooooooo impressed with this as being the safest possible treestand device on the market that I was just getting ready to post in the product reviews (and will) but will also post here.
As soon as I saw Dr. Woods (originator/designer) promo video I knew I wanted one but the cost was high enough that I was sure I'd never afford it before my hunting days were over (76 next month). However, the more I watched that video and read about it The more convinced I became that i would feel much safer with one - sooner, rather than later. A dear old friend told me about a company (not a sponsor - yet) that "Demonstrates" the products they carry, and have the lowest price plus limited time free shipping. I checked them out and their demo video was perhaps even more convincing, So I ordered one and it came UPS (free shipping). This thing is so well thought out, planned, designed to cover all the little things that others don't quite get right, although they may "do the job", that I give great kudos to the designer. I also praise the company I ordered it from just for making it where my budget break (recent bingo luck) would allow me to order mine - NOW.
IMO everyone should do yourself a favor and, at the least, check this "One" out with an eye/mind towards how much value your life as a non-disabled hunter is to you and your loved ones, no matter how many seasons you may or may not have left :D
(put it in a search or PM/e-mail me - I get nothing out of it but safety satisfaction)