Picked up the GL 320 about two weeks ago and couldn't be happier. Got rid of an XC 90 over size and quality issues. Compared to the GL, the XC90 feels absolutely asthmatic. Love the power and torque of the diesel. It's a little noisy in first gear but it's no worse than the whine and groan of the Volvo. I drove every full size (not giant size) SUV and nothing in this class compares to the GL in terms of space and comfort. Getting 23 mpg blended around town is a happy bonus. Drove the V8. Love the sound and it's faster overall, but around town with kids, not worth the fuel economy trade off.
Beautiful interior design with stitched dash and wood accents. Comfortable seats. Real 3rd row. Power 3rd row seats and tailgate. Satellite radio, Nav, and Bluetooth are very cool. Combo of 7 speed transmission and diesel torque drives like silk.
Low end acceleration is great but maybe a slightly larger engine with more horsepower would be nice for higher speeds. Current engine gives up some fuel economy to cruise at 75 mph.