I've only owned the Marsupial gear bino harness and the Vortex one that comes with their binos. so I can't offer up an opinion on which is best among all of the ones out there.
However, I can list some reasons why I like the Marsupial.
-It's a streamlined shape and not bulky at all.
-The front opening is something I like much better than the stock Vortex harness.
-Inside fleece lining is quiet compared to the nylon fabric liner of the Vortex.
-The bino harness and the Range finder pocket attach together closely which keeps the rangefinder from moving around too much.
-The magnet opening is easy to use and quiet. This assumes that you just don't allow the magnet to snap shut. Just use some control and it's quiet.
*** However the Magnets DO mess with your compass. It may not be that much of a concern these days since most don't use a compass. If you use a compass hold it away from you and below the waist to ensure the magnets don't interfere with your compass.
- The optional bow holder clips are nice.
- Made in America. I care, maybe you don't. It's up to you who you give your money to.