Mine works fine, obviously u need your key on you and stand close to the bumper. But works probably 95% of the time.
I have more issues shutting it. Had about four occasions where it won't shut, and I have to close it manually, but keep opening it again. Can get quite embarrassing in my Morrisons car park closing it, the car then unclicks it and it pops up again, rinse and repeat until swearing. My only guess is that it thinks the key is in the car and does it to prevent you locking yourself out.
Anyone else had that?