Hey that pic is of my one!

They are easy to install, my dealer did it before I picked the car up but they left the install instructions in the trunk and it looked really simple. It is £250+install (install is £75 per hour) here in the UK. I bartered as I had it done when I got the car and got it for half that and no install cost.

If you ask me it should be a standard item on the car. I used to have a BMW Z3 M Coupe and that had one of these as standard. Without it there is no security for your items in the boot, any passer-by can see in.