The RDX is exeptional in every way...I'd recommend it to anyone. The quality is second to none. But I want to stress the superiority of the NAV package. After a recent road trip in a friend's Lexus, I am embarrassed for Toyota. The Honda Navi is far superior...the joy stick, zoom in/out, changing addresses on the go, categories of attractions, etc. The Acura Navi is intuitive, easy to use, fun and informative. I only have Lexus' to compare it to, but that Toyota's is a total waste of money.
Turbo, Navi, seat heaters, handling
Nothing...maybe better gas mileage, but that is being picky. I averaged 21 combined mpg.