These do what they advertise. I?d expect to pay more for a set of four. -£90 is a bit high. Unlucky me, but great mount for sure. I ordered a 7 M because it did not come in a wide. I wanted a light weight, compact pump for my bike. Im able to do all 3 with this mouse. Regarding sturdiness: the kayak holder is very sturdy once clamped with the locknuts. The mic cut out -- so my essential work headset is now a really expensive pair of ear buds with a foamy ball in front of my face. Its not the top of the line (I couldnt justify spending $80+ for my first big boy turntable) but its definitely one of the best for the buck and the best I could find at this particular price point.