Expensive, and weighs the same as my whole bike, but it works well.

The good:
The collection of shims Supplied Means thatthis will fit most frames (mine is a steel singlespeed with small diameter tubing).
The fitting process itself is quite easy.
Grip is excellent thanks to the rubber sheet (the black square in the bottom left corner of the image).
It hasnt rusted, Which is good, considering That I have a lot of wet rides and nearly everything else on my bike has rusted.

The bad:
Very heavy.The Good News Is that the weight of scrap metal is probably worth the buying price. You could therefore use it to anchor a mediumsized yacht. Jokes aside, it's so heavy, indeed the whole bike's balance feels different (and I have a heavy bike).
So, if you own a woman's Gazelle (ie a "step through" frame), then you will have difficulty getting this to fit on the frame Because of the shape of the tubes and the rear pannier attachment. It is possible though, but not easy, and I had to machine off some of the seat release lever in order to make it fit.