Im buying these locks from beginning so mount is become better and better.
Very good frame mount (to go with excellent lock). A bit expensive having it shipped from USA to UK. The edge that touches the bike - particularly around the hole for the bolts - might be reinforced better. Sooner or later it gives way and turns into a big hole. After the first time, I learned to hold the mount on with cable ties.
If you have 2 bikes, this is a must have (unless you want to purchase two locks and only use one at a time). My only nit is that it is designed to sit on a flat surface, so it hovers a bit over the rounded bike tube. If there was a rubber gasket that would allow to sit snugly over a curved tube, it would feel more stable - though it's quite stable as designed. Overall, quite happy.