Yep I had an '11 that I bought new and just traded it November. It was an auto and loaded up with Recaros and all that. It was a really great car. I loved it and put 84,000 miles on it. I commuted about 70 miles round trip a day in crappy traffic when I bought it, hence the auto.
The rear end did suck. I tracked it a few times (road course) and had to replace the rear once. Probably my fault for not immediately addressing it. Near the end of a 20 minute track session some overheat rear diff BS message came up on the DIC. I didn't stop....didn't change the fluid for thousands of miles. It started grinding and howling when turning. Bearings were toast. You can do an aftermarket cooler or there was a GM one for sale as well...or if you just drive around on the street don't worry about it.
With drag radials it went, if I recall correctly 12.02 @ 115 or 16.
There was a recall on the supercharger for rattling like it was full of marbles. Mine did that for a long time, had it fixed under the recall warranty before i traded it in. They said worst case it would seize and prevent the car from starting.
I traded it in on a '15 Jaguar F-Type R. The Jag is bad ass car for sure, but way different. The Caddy was an absolute everyday car, 4 doors, super practical, super fun, I kind of miss it.
It's in your neck of the woods somewhere. A guy that owns a performance shop in the NE bought it from the dealership I traded to and said it was going to be putting around 1k HP to the tires soon. I'm happy it went to a good home.