First things first: the 2010 Cadillac STS is completely unchanged since it was last redesigned for 2008. The only different is the availability of two new exterior colors. The 2010 STS comes in only one trim level but with your choice of either a V6 or V8 engine, not to mention the several option packages available. Still, the STS continues to defy the stereotype of a huge Caddy sedan, with optimal handling, magnetic ride control, and not to mention a bold look.
If you're looking for more back space then the STS is not for you since back seat space is scarce. Too bad that the word out there is that GM is getting rid of this good-looking full-size American sedan.