Top positive review
and I like that the tension can be tailored per fret as ...
Reviewed in the United States on June 16, 2017
I've used these since I learned guitar in college ~10 years ago. I don't recall why I went with it back then... as an engineer, I think I just find the design elegant, and I like that the tension can be tailored per fret as the neck width changes. Basically a capo should simulate a finger bar, so you only need as much pressure as it takes to touch the strings to fret x; more will distort the overall length of the strings and things will be "off."
I can't help but evaluate things for long term usage. Most spring based capos will likely last plenty long. It's just that in principle, there's really nothing to wear out on these, especially since they moved from the sliding rubber piece to a roller. They're just a cam system with no parts to break or wear out. From a practical standpoint, it probably doesn't matter. In principle... I just can't help but rate them above a spring clamp design :)