I have a 2012 IS250 with AWD and NAV.
Interior is very high quality.
Seats are comfortable, although the backseat is abit tight but still comfortable.
Ride is abit stiff, but handling around corners is excellent.
Power steering is a little stiff for being electric, but will have the dealer look into that.
Gas mileage is good for V6 (27 MPG).
Very sporty looking, gets admired by other drivers.
Heated/Cooling seats, NAV, Sound System, leather seats, LED daytime running lights, no key entry/start. Quality of interior material.
Need a dual driving mode switch soft/sporty like some BMW.
More power steering.
Too sensitive to uneven roads, it tends to drift.
Need a bit more power.
Need more interior leather trim.