First, the ease of installation. Took me less than 30 min and did not have to remove the top triple clamp.
Second, the unit keeps the same tension all the way from left to right, which is great for the type of riding I have done. And wide range of adjustability.
Last year, a friend of mine (also with an Africa twin) and I did the Idaho BDR from Canada and into part of the Nevada BDR. Where this unit showed me it's value, was when we were going down a steep trail with softball size loose, sharp rocks. I made it down without dumping the bike. My friend ended up dumping his bike part way down, so I took it the rest of the way down for him. Holy @%$#, I barely kept it under control and had to almost walk it down. Handlebars all over the place.
It also performs great on med to deep gravel. Roads I have travelled previously, I can go 10 to 20 mph faster than before and feel more stable. I had no idea how well it worked until I rode another bike. It has great adjustability, takes a little figuring out proper settings, but can be done easily on the fly without slowing down.