I would not buy a Range Rover or Discovery they are probably the most stolen vehicle at the moment, I have recovered 5 yes 5 in the last two days. If you must have one be sure and fit a proper Tracker, that's the ones I get back. Usually next day or the day after
It doesn't say much about the inbuilt security if they are that easy to steal... or is it the keyless entry "amplification" routine being used?
Mercedes has introduced a new layer of security. Lay your key fob down on a shelf or table and after 30 seconds it turns its self off, until picked up. Logical and simple.