I've had this on my bike for a few months now, and all I can say is I've almost forgotten it's there. That's a compliment to how good it is, it just gets on with the job of keeping my chain on. It's quiet too.
I've had no problems shifting gears with it fitted, and aside from a bit of head scratching, it was fairly easy to fit. Does take a bit of juggling with washers and spacing, but it's not difficult. Perhaps the instructions could be a little clearer.
The only thing I can really moan about is it's not available in orange.
