My dad goes to this place for many of our auto needs because they're convenient, and he trusts them. He pays for the repairs (most of it anyway), he wants it taken there.
HOWEVER, for many Mercedes-specific services, or other Mercedes-sensitive services, I'll take it to the dealer. So if he can't find anything wrong with the suspension, or steering (I'll assume the mounts are OK), I'll take it to Fletcher Jones, one of the highest volume servicing centers for Mercedes.
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)