Great fender, easy to install, right on the seat post. Gives a good amount of coverage as well. Had to adjust it a couple of times on my first ride to figure out the right amount of tension to keep it from moving on the off-road part of my commute. To be expected though. Overall great product.
I think it is a good product in terms of keeping my back free of mud, but it is hard to install based on the pictures. I still don't know if I installed it correctly. I think an easier mechanism for attaching to the seat or better directions would be helpful. Overall, a good product that does what it says it will!
Use it for light biking/commuting. Works great but tends to go akimble if it rains and the the rubber ring loses traction.