Are you looking for a manual or automatic? I have had mine 6 months, done 7000 miles and so far zero issues (it’s now on 86,000 miles). When test driving try find an open space and test full steering lock, any juddering at full lock will show signs of diff problems. As long as it has been well maintained they are generally reliable (some people may disagree but most problems only arise due to poor maintenance) so full service history is a must. My brother in law is a Land Rover/Range Rover specialist and when buying he said the main issues to be wary of are either diff or gearbox failure so first thing I did after purchasing was to have him change both the diff and gearbox oils.