Used to work with the Range Rover mechanics and my neighbour had the Diesel one. Neighbours one was continuously breaking down and he had it from new. Dont go the manual (if they did the diesel in a manual) as the gears are quite a reach, well 1st was for me and I am 6ft. Only drove one manual which was a petrol. Comfort wise, I rate them highly as I delivered a fair few to customers.

Cant really say much on reliability as a whole, only from my neighbours experience.