After some very expensive minor repairs and service to our Mercedes E320, My wife and I started researching alternatives. We have owned mostly German and Honda cars for many years. (Except for my jewel- like '94 Vett). She thought the CTS was too "edgy" but was totally taken by the STS. I was a little skeptical until we took it for a test drive. It was really impressive and comfortable. The first 1000 mile trip yielded 25 mpg on regular gas. Some of the controls are a little unfriendly but well worth the time to master. Last night I started the STS from inside a restaurant which turned on the heater & seat heaters during a snowstorm. The warrenty and OnStar are great.
The combined comfort and handling are great. For comfort and convenience, the remote start and programmable individual settings are impressive.
Trunk should open when unlatched and have better access. Also, the glove box needs improvement.