My V6 STS rides, handles and generally feels better than the 2003 Seville V8 STS it replaced and so far seems screwed together loads better than any previous GM I've owned. But the styling outside and inside seems too bland. Designers seem to like the plain, trimless body sides these days (probably cheaper too), but on this car, like many others (BMW etc) there is too much flat sheet metal from window sill to rocker that will only attract dings and chips which will be accentuated by the flat expanse. On the inside, the voice navigation system really needs work and I defy someone to find the clock when stuff is turned on. Room could be better on such a large car.
Front and rear styling is distinctive.The Bose radio is tops.
Install the rocker trim like on the V model and maybe a side molding over the lower body crease. Inside, if you are going to have a clock, make it an analog tank type, like the '06 DTS. Either use real, full length chrome door sills or eliminate them like other GM cars.