Perhaps you should google around to find some reviews of the X6. I found the video reviews most helpful. I'll see if I can find the ones that I watched this weekend. Both good and bad. Some of them are quite entertaining. Here is a sampling:

I like this one the best:

YouTube - BMW X6 Review

YouTube - BMW X6 Sports Activitiy Coupe
YouTube - NEW Top Gear Aus: Ep8 - BMW X6
YouTube - BMW X6 [Motor Trend]
YouTube - BMW X6 xDrive35i | Infiniti FX35 [Motor Trend] [liked infiniti better, but mostly because it was less expensive]
YouTube - motorguru.com - 2008 BMW X6 Car Review (Full Length)
YouTube - BMW X6 xDrive 35d 2009 MSN Cars test drive

Not so good, but he was driving a 35d:

YouTube - 010 Top Gear Australia - BMW X6 Coupe 4WD

Here is the TopGear one from Jeremy Clarkson, its a bad review, but this guy is biased against BMWs. Also, he's doing trying to go off-road with summer tires! Even though it is a bad review, its very entertaining.

YouTube - BMW X6 car review - Top Gear - BBC

Then, after his ugly review, here is a good one from TopGear where they took the X6 into the Polish wilderness with off-road tires. Its in print, and long, but its also very entertaining.

Top Gear’s BMW X6 Off-Road Review

A lot of reviews ding BMW for being more expensive compared to the competition, but when I configure them to be almost exactly the same, the others are more expensive. Sometimes significantly so.