Here's my thinking on our new (hers)
2014 GLK...smoother softer riding...complicated controls...small o/s mirrors (gas mileage not yet determined) Nav. worse than the Garmin I use in the X5 and 10x the price, b/u camera is nice
2006 X5 (3.0) stiffer (sport package) more "solid" feeling, no "fussy" non user friendly controls (shitty gas mileage) more comfy seats
The GLK seems to be bigger than an X3 and almost X5 in size ....
We only have the M/B 5 weeks and 1000 miles, so what else will I notice?
I actually mostly drive my Z3, but now that the X5 is off wife use, I am enjoying it till it gets sold...

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BMWCCA # 12660
14 GLK 350 M/B (hatefull POS gone)
05 CLK 500 AMG Cabrio
07 530xiT
09 Boxster