Not really sure what the price was: I bought a couple of small things (the shop is my usual "dealer" back home :lol: ) and the credit card statement said 50 quid... so considering exchange and the other stuff I bought it might have been roughly 40 euros.
A few things to be said: I seldom use the sat nav, I don't like it too much, still a fan of paper maps and "following the road".

On the R1150R I used to place it in the tank-bag, under the transparent part.
That's why I was interested into this GIVI thingie.
I use no tank bag on the S. You usually drive with your chest on top of the tank... a bag will be a pain
Fixing the tomtom into the bag takes some time (the tomtom one is really small, bigger sat nav might fit in a easier way), and you need to "block" it properly with the provided straps, otherwise it will float around.
The bag it's quite large. I think it was initially created for scooters and maxi scooter use.
Visibility is bad in direct sunlight, but I already knew it since the tank-bag experience
The transparent plastic sometimes pushes on the tom tom screen activating the menu, etc.
The easiest thing for me so far is to set the tom tom outside the bag and then put it in.
Experience for other sat navs might vary
Apart from this is a nice
quick and dirty solution, especially if you don't want to buy or use any metal mounts and waterproof plastic cases to use the sat nav a few times during the year.

A waterproof protection is included (but it's not shown in my photo).