I live in Sterling, have used Sterling BMW once for service but, wasn't blown away or overly disappointed either. I DO know that, while it's a bit of a hike for us Loudoun County folks, Tischer BMW (BMW of Silver Spring now) has fantastic service - highly recommend Kevin Hull (SA) and Ryan Keller (Tech). Ryan is a fairly young guy and they seem to be pretty mod-friendly as long as you're not overt about it. They've MORE than taken care of me.
2009 E92 335i M-Sport - Space Grey Metallic
*SOLD* 2011 Lexus IS-F
*SOLD* 2007 E92 335 BSM
Listen to my music @ www.ryanmosel.com