The magnetic ride suspension is fairly pricey. I think I have seen people posting prices of having the dealer replace it for $1500-$2000-ish, not sure if that is all 4 corners or just two at a time. If you are handy, the front struts are $400 on Rock Auto, when the time comes. That will be the way I go.
I recently bought a 2016 Premium, non-Vsport, just the FWD N/A 3.6. I bought it right after thanks giving with 85K miles for $17500. At the time I thoguht it was a great price. I could pretty much get what I paid for it back right now. The price that chazglenn3 paid is really good. I thought about going for a vsport, but didn't want the premium gas tax or the slightly lower MPG. I wasn't looking for a scorcher. That 3.6TT can be tuned to make some insane power.
Overall, I'm still extremely please with my purchase. I've only put about 4K miles on the car since I bought it, but it is a joy to drive. It rides very well, is quite and very comfortable. I bought the car planning to drive it for the next 8-10 years, and after 8 months it still brings a smile to my face.
I kind of feel these cars are a little overlooked and people go to the other vehicles in the Cadi line up and therefore prices are a little lower. When I was looking, there were Impala's with similar miles that were selling for more than the XTS.
I really don't think you can go wrong with one.