I have owned a 2014 Buick LaCrosse Premium II ftor three years. I bought it as a retirement vacation car and it has not disappointed. However, a few notes:
The seats are very comfortable providing great support while not being hard or stiff. But, I did notice that the non-ventilated seats in the base models were more cushy than the stiffer ventilated seats with the perforated leather. The lower trims also do not have the same power adjustable lumbar support on the passenger seat as on the driver side. The bladder in the lumbar support squeaked since the day I bought the car every time I moved, so after 2 years of annoying noise I had it repaired/replaced under warranty. It is now silent. The buzzy alert seats that are only available on Buick and Cadillac are great. I prefer them to a chime and I have gotten to depend on them for backing up, lane departure and cross traffic. They work great. When I drive a car without them, I miss them.
The backup camera is fuzzy on my car. It's useable, but not as clear as other cars I am familiar with.
As would be expected in a Buick, the ride is extremely smooth and comfortable. But, if ride is more important than handling avoid the 20 inch wheels. They tend to crash over road imperfections and are noisier than the 18 or even 19 inch wheels. The 20 inch wheels do come standard with a hyperstrut front suspension with continuous damping that allows you to select between sport and touring settings. This adds to the handling prowess but the base suspension with the smaller wheels is still quieter.
The trunk on the 2014-2016 LaCrosse is small. Much smaller than your Lincoln or a Taurus, and even smaller than an Impala. In fact, you can get larger trunks on smaller mid sized cars. The Verano actually has a larger trunk. But, the back seats do fold down 60/40 so that compensates somewhat.
I hate Intellilink. I have read repeatedly that it is one of the most intuitive systems available, but for me it has been infuriating. Very slow to respond. Poor voice recognition. There is no detour function in the Nav. I would skip the Nav for the GPS in my smartphone, which works much better. Or, just use OnStar. Paying for OnStar for years is cheaper than the Nav system. Intellilink would now be a deal breaker for me.
I was also disappointed on the day I bought the car that it did not have a power tilt steering column. I had test drove an Impala and a XTS and both had a power tilt. I signed the papers and was on my way out of the dealership before I realized it was missing....too late to do anything about it. I miss it, but I have lived with it.
This website has not accumulated enough LaCrosse owners to offer informtion about reliability. I find this disappointing. I don't know if the car is that rare or if LaCrosse owners are not interested in participating. But, considering this car has been manufactured for many years now, you don't see many on the road. I do feel like I am in an exclusive club.