Before I ordered my new F10 I actually drove a LaCrosse as it's had some good reviews (especially with the turbo now just coming out). It wasn't half bad. At the price vs the BMW, it would be a good value.
That said, you'll notice I didn't buy it. I couldn't bring myself to drive a Buick. I also tried out the CTS but didn't fit in it.
2011 535i imperial blue/beige/sp, premium 1 and 2, ventilated seats, top view camera