I dunno. I have one of these capos. It accommodates arched fingerboards very well because the "finger" can press down on the string at any height unlike the straight bar kind. It makes it quite flexible.
I had some buzz too, until I realized I wasn't tightening it enough and it was [tiny bit] lifting up when I brought the "finger" down on the string.
Also I took off several fingers to get better access to the fret behind and the fret right underneath-no reason to have all [6] "fingers" on, unless you wanna use as a ful capo.
It works fine now. No problem about no rubber either-actually it allows you to fine tune a little bit because there's no rubber. Very useful when used as a ful capo.

Mainly I love all the different things you can do...any combination-alot to experiment with...