i had a 2008 RR sport HSE and i never once had to take it in for anything other than normal servicing. it was as solid as a rock (much more so than my e60 or F10 for that matter) and would whole heartedly recommend it. big, powerful, holds lots of stuff.
but it's a truck. make no mistake. it can climb rocks and go through mud and is significantly over engineered for what many people use it for. i would put a RR or RRS up against a hummer any day. still, wont be like an F10 550 re driving dynamics
but as far as reliability goes? that should not be a concern
2013 E70 X5 50i, Saphirschwarz, Dark Burl Walnut Trim, Multi-contour Seats, Sports Activity Package, Premium Sound, Running Boards