I have been using this harness for over a year now, mostly for bari sax. Once one gets used to the "wedgie" factor, this is a great harness.
One advantage I have not seen mentioned is that one can adjust the cords so that the left side is longer than the right (without having to re-tie the cords). This is excellent for instruments played to the side. Adjusting the cord lengths like this distributes the weight evenly across the shoulders.
Another great thing about this harness is the hook. It is secure, in that it is fully closed once on an instrument, yet it is easy to attach and remove. This is great for quick instrument changes. I have had to just hang a tenor sax around my neck while playing a few bars on clarinet and this harness was very secure.
As one review mentioned, even with the weight distributed evenly, the left side the left side strap will still ride up to your neck. I get around this by wearing a shirt with a collar, or I put a small towel between the left side strap and my neck.
This is my most used harness. I have tried most all styles of sax holders, straps, and harnesses (always looking for the least expensive one). This is the one that I feel gives me the most secure and comfortable hold of whatever instrument I am playing while still being extremely compact and easy to tuck in a case.
There may be better and more expensive options; however, I now have no need to try them.