Quicksilver ML

Hey Everyone, need to get the trans service done on my new to me 2008 ML550 and wanted some feedback on the various independent shops. Burdi, Benztek, Eurobahn or just spend the extra and take it to the dealership. Would love to have a go to guy locally. I normally do all my own service but given the how infrequent the car needs maintenance and that it's winter in Chicago I rather take it somewhere.