My dad has a 05 RR HSE with the BMW motor, and its been ok service wise.
Coolant tank leak 3 times so far, replaced coolant tank 3 times. Random electronics are finicky like the ECU fan, locks, air suspension tank leaking, etc.
Overall, it's a good car, just costly repairs if out of warranty. This is a car you DONT WANT OUT OF WARRANTY.
Check out rangerovers.net for good info:
http://www.rangerovers.net/
Forum:
http://www.rangerovers.net/forum/