After several hours behind the wheel, I discovered the value of the SSEi's seats. They have a wide range of adjustment, including multiple segments for the lumbar region and the lateral wings that adjust in and out. If you can't get comfortable in these seats you are certainly the exception. Curiously, the SE's seats were almost as good, just not as easy to tailor to individual body types. The Bonneville's instrument panel is configured to be like that of a European sedan.
Gauges are large, simple and easily read.
They glow red at night, like a BMW, and make the cabin look like an airplane cockpit. Both of the cars I drove had radio controls on the steering wheel, which is not only handy but provides a level of safety since you don't have to take your hands from the wheel to change stations or volume. I would for the steering to have more on-center feel, but otherwise it was fine. Legroom in the back seat is adequate for adults, but not as generous as some of the other cars in this class. The trunk is quite large and had a cargo net for securing small objects.