Yup... people just be careful checking your coolant levels. Check the reservoir first, don't go in and pop off the rad cap if it's hot or even remotely warm to be honest. When it's cooled off, if necessary, turn the rad cap a little bit first just to let out the pressure but still be locked, and then turn it off all the way.
All newer mercedes engines have their temp gauge read above the mid-line. This is normal.
Also, their temp gauges actually read the temp and fluctuate while you drive and stop at a light. Never had a car with a temp gauge that is accurate like this.