Fits perfectly, no wiring issues, setting interface could use a bit of improvment
Amazon Customer "biz", Amazon
7 July 2014
Summary: I replaced the OEM unit in an SLK230 Merc iwth this unit. It was a direct slide in fit - no issues. The wiring harness from the Merc just plugged in and worked. The only thing I ding it for is the UI for settings - a little tricky to go through the menus. In addition, it has the same short coming of all Bluetooth implementations I've seen: I really want this unit to connect to my phone for media stream but NOT for calls. I use a BT headset for calls.
Summary: This unit has one of the worst owner's manuals of any product I've ever purchased. Fortunately, it is easy enough to figure out that you barely need the guide anyway. I like the simplicity of the controls, and the features work well. The display is clear and the menu options are intuitive. It looks good and sounds plenty good for my 20-year-old pickup truck.