My 2011 has been great...with the exception of a few issues. I have had the dvd player replaced for the rear seat entertainment and I had to bring it in to have the surround camera/blind spot monitoring system repaired twice. Also, the rear door weatherstrips were rubbing on the door skins, causing the paint to wear off and surface rust to accumulate. They had a body-shop repair the spots and install new weatherstrips on each of the rear doors. Otherwise, the truck has been mostly fantastic. Oil changes may be considered expensive to some as the 5.0 take full synthetic. I had the front brake pads and rotors replaced around 27,000 miles along with a brake system flush. Haven't touched the rears yet.
I have heard that the 2010+ Range Rovers are much more reliable than the older models, however the 2010 still is prone to a few more bugs than the 2011-2012 Range Rovers.
Ask for the service history records and a carfax.