Have only had for a couple of days but wife has 09 version.
Biggest differences are exterior styling and much better interior.
Haven't pushed it yet to know what the XDS is all about but really fun to drive.
Smooth shifting 6 speed
Great leather seats
Dynaudio pretty good for OEM unit
Great engine noise but very quiet ride too
Availability of auto dimming mirror would be nice
Wish the radio would mute when nav commands came on...previous car (08 Acura Rdx did and it's nice feature)
Dash still to bright for me at night even with dimmest setting (but that may just be a function of my nearly 50 year old eyes)