I've had my 2009 E83 2.0d MSport for almost 3 years now, and it now has 160 000 km on it (bought it with 100 000 km). Extremely versatile, lots of space, remarkably good handling, and more capable offroad than you may think too. Only problem I've had was a noisy belt pulley, which was a quick fix and not hugely pricey. Maybe I'm a bit more anal about my cars than some, but it still looks and drives like new. Average consumption (50/50 town and highway) has been 7.8 l/100km, but you can get it below 7 on the open road if you keep to the limits.
Mine has the staggered 18" dual-spoke M rims on it, which look good but are a pain in terms of tyres. As was mentioned, it is critical that the same make of tyre is fitted all round and that you don't have a big difference in tread wear between front and rear. The staggered setup makes this more difficult, as one can't rotate the tyres. I am also having problems at the moment in sourcing the Dunlop SP Sport 01 tyres, seemingly the only tyre available locally in this size combination (255x45x18 and 235x50x18) that works on this vehicle. Monitor tyre pressures closely too, as I detected what seemed to be a transfer case noise / vibration, but then found the rear pressures were about 0.3 bar too low. Inflating them cured the issue completely. IMHO, if you have any sort of drivetrain noise or vibration, the first thing to check on these vehicles are the tyres.
I will likely keep it for another 100 000 km, if not more. Far better vehicle than I was even expecting when I bought it.
Dave
