Been driving GS for about a week. Got a great price - $3K below invoice w/ all sorts of options including nav. Ride is smooth. Been getting 34.9 MPG average! That's not a typo! I'm picky about noise and thus far road/wind noise is relatively mute. Tire noise is minimal on most surfaces. No squeaks and rattles so far. Researched my purchase up the ying-yang. I compared M35 and RL but always came back to the GS b/c of its sporty looks, quality, and overall value.
Smart key access; pwr tel/tilt steering wheel; nav; premium audio sound (didn't need Mark/Lev); seats; and sporty look of course!
Allow nav entry while driving; same for dialing phone through car (numbers are hidden while driving); more voice commands such as "go home" and "call ___"; a little more leg room in rear; truck entry (ok for me though).