I guess it's been years later...In part I didn't venture into tough conditions and thus never needed to bring the harness out until recently.
I choose to go out on a day it was raining and with wet snow fall to really test out the new Eskimo Outbreak 250XD. That's slush making conditions with the given packed snow on the lake already. It was conditions that would make pulling a sled by hand somewhat with a lot of effort. The conditions were also that if one wasn't wearing any type of crampons or ice cleats, one would probably just be losing feet grip. Not exactly sure how much weight I have in my sled but, there's more than enough weight.
I used a gym shoe utility bag or whatever one calls them with the string enclosure to carry the Fringe Sport sled harness. I find that cold hands makes using the steel carabineers a bit cumbersome. I wish the carabineers were larger so it would be easier to get a bigger gap to snap onto things. The tow strap loops are doubled hence that gave me difficulty with the cold wet hands.
On my initial tow out onto the lake, it was quite efficient. The slush conditions was bare minimal and it was mostly just wet packed snow. With the Hillsound Trail Crampon Pro it was a good working solution. Soon I forget the weight of the harness and was feeling the weight of my sled. On my way back was when the slush conditions started to set in. If it weren't for the Hillsound Trail Crampon Pro, I would be very much more sorry my arse. I stopped a few times due to exhaustion and my sled basically glued itself to that spot. If it weren't for the grip from the spikes, I would've been slipping. So I made sure with each step that I firmly plant the spikes with the most stability and grip. Plus I had to be carely not to trip the quick release straps on the crampons.
Overall the sled pulling harness worked really well for me. I did not once feel any binding or pinching from the harness. That's all due to the construction of the harness with the wide straps. Shouldering the harness was easy also due to the wide shouldering of it. The oversized buckle was very easy to put on with gloves and very easy to release with gloves on too. Given that the overall weight of the harness is for sure obvious, it's function in efficiency was much better than a light weight deer harness. I probably wouldn't use the three way two straps for pulling a deer cuz I'm sure that V will catch a branch or tree stump and get myself hung up. Otherwise the harness is very comfortable in action.