I was waiting to see if anyone else piped in. I am sure no one responded because this type question is asked at least once a week or more.
First I would do some reading in this section and the RR portion of the site, as well as spending some time over at
http://www.rangerovers.net/
What you are going to find is people with issues and people without them. It is basically like any other vehicle in the world as far as its maintenance requirements, except if you take it to the dealer and are not a home mechanic you probably can't afford to fix it for long, if issues do come up.
I have only heard of one or two Land Rovers (remember the Range Rover is just a Land Rover) that have actually left someone stranded, so I can say they are better than even the newest vehicles on the road. But if it hasn't been maintained very well up to you purchasing, you will need some money or at least some time to sort out any issues.
If you know anyone locally that owns/works on their own Rover, then take them with you when you go to buy or spend the $200 to have a local LR dealer to look it over. If nothing else you post everything they say is wrong, someone here will let you know how bad this issues are and real costs to fix them, and you can use that info to reduce the price....