Bought this from a different supplier, and the bag part is good, infact its too good, in a down pour the heat from your sat nav unit will cause the screen of this to steam up and make it impossible to view your sat nav. Good old bob heath sorts that.
The plastic bracket is terrible, used that part once, and my sat nav fell off when I was parking at my destination, the only thing holding it to the bike was the charging lead.
If you can get past these and are a bit handy with a few nuts and bolts, you can have a cracking piece of kit. 4 bolts, a couple of drilled holes and my unit is now secure, its on the bike all the time and works great, dont know how I did without it.
sat Nav is easy to read, providing you treat the screen with bob heath ever now and then, and its all nice and waterproof. Love it. Just dont trust that stupid little plastic tab to hold it all together, it wont