I actually ended up keeping the Marsupial and returning the SG Skyline. It could just be that I'm more familiar/comfortable with the Marsupial, but I personally felt that it was more refined, polished, and simple. The one-handed option is a complete breeze and their magnetic enclosure system is brilliant.
With the SG, I toiled with setup for quite a bit trying to get the sizing right via the front velcro and back plate. When following the guidelines on the included fit card everything was way to tight for my NLs. I believe this is due to the fact that the fit instructions rely on the total length of the binocular, but don't/can't account for the girth of a given binocular (there is a finite/set amount of space within the binocular enclosure that will affect the final fit of a given set of binoculars).
Once I finally got the velcro/sizing dialed in, I just couldn't get the enclosure to open/close easily with one hand. Even when I loosened up the shock cords, operating the lid would tend to take enough force to lift the harness off of my chest a bit, resulting in what felt like chasing around the binos on my chest when trying to open/close the lid.
There is also what feels like a carbon tube in the top section of the enclosure (which is what you would pull up and over your binos to secure them and close off the lid), and it always seemed to get hung up on my eye cups and also never seemed to come up and over my binos straight (it would always end up crooked or diagonal across the top of the eyecups, forcing me to use my other hand to straighten out the carbon rod and tuck it over and behind the eyecups). I also found that the material, while lightweight and waterproof, would have to be finagled with to lay right. If you simply close the lid with one hand, things just don't end up laying right. It's a very hard thing to put into words, and one would have to just know what I'm talking about. Perhaps the material gets better with use and just needed to be broken in a bit.
In the end, I found that the Marsupial harness required zero setup along with simple, repeatable, and reliable one-handed operation. That being said, there are several things that I like more with the Skylines. First, the buckles are quite a bit larger on the Marsupial harness than on the SG (I much prefer the lower profile buckle system on the SG). Another plus for SG is the single point of attachment for your safety tether. I love the idea. Lastly, the built-in waterproof lid on the SG harness and rangefinder pouch is awesome. With the Marsupial, I will need to purchase a separate rain cover for the harness (and they don't even offer one for the rangefinder pouch). Not even having to think about anything when the rain starts is just fantastic. SG nailed in on many fronts.
SG is a fantastic company and this is their first iteration of a bino harness. I'm sure things will improve and they will refine the system, but for me, I just couldn't force myself to love them - as much as I wanted to.
I hope this helps.
Edit: I wanted to add one more thing. Padding. The Marsupial has padding in the lid, giving your eyecups quite a bit of security. There is no padding in the SG lid, it's just a thin layer of fabric that lays across your eyecups. Forgot to mention that as one of the other things that I disliked about the SG Skyline.
www.marsupialgear.com
