2006/2007 E320 CDI Wagon - opinions

I'm noticing a lot of these on the market these days in good condition, under 100k and for a decent price.

Any opinions on;

1. Reliability
2. Maintenance costs
3. Driving and Ownership Impressions.

Keep in mind I particularly want a diesel and a wagon.

Currently running a 1994 W124 E220 and she's running well. But wife thinks it's time to upgrade.

The W124 is a 7-seater though and the new ones don't have that option. Which is one demerit for the W211