I bought this using Amazon Prime's delivery service and recieved it within 24 hours, along with the OS map I needed for the area I was riding - great. The next day I spent 6 or 7 hours riding in the Dark Peak area of Derbyshire, on pretyy bumpy stuff. The map and case together were great, although I noticed the velcro straps on the case didn't tighten up on the bars for a totally secure fit.
This might have been the cause of what I noticed at the end of the ride, whilst packing away. The velcro straps had started to pull away from the clear plastic, to the point where there was a small rip, say 15mm long, where the strap had pulled away.
This after just one bike ride.
I'm not convinced this item is totally fit for purpose (an understatement).
Nice design - works well and is easy to use. Let down by poor execution and inappropriate choice of material. As another reviewer has said, a softer grade of plastic would probably work better.
I've posted back to Amazon today - in the past the returns system seems to work. If I have any aggro on this oocasion I'll update this review.
Buy something else if you're going off-road.