Slick design, funtional, unique mechanics
When I say slick, I literally mean "slick". I can't fault this little contrivance, except to say the levers that one squeezes to open the jaw are slippery, and the clamp gets in the way of my finger. I had one of those give-away rubber business card holders with self-adhesive backing, that I cut into strips. I attached these strips to the levers. I now don't have the feeling that the capo is going to twist out of my hand and launch into my expensive guitar each time I'm installing it. A factory application on the levers, of some type of non-slip layer would make this almost perfect. It does work very well, and the tension adjustment is brilliant. Adjust the tension only until no string rings unclear. This will keep the retuning after capo installation to a minimum if it's needed at all, as the strings won't be overly squeezed.
As nifty and functional as this capo is, I do find that the rubber section that clamps over the strings to be a bit too high at the top, as it interferes with my index finger a bit. I have to compensate for it when I'm playing, and it tends to get pushed up the neck towards the nut end a bit as I play. A mild annoyance, but I deal with it because it works so very well otherwise.
Maybe a future model of this will handle these issues, and I know that for some, these issues won't be issues at all (YMMV). Happy playing!