Cool to see one on BAT....Definitely hugely underappreciated cars, and as some of the comments suggest, the last 'real' Cadillac in that it's a full-sized unit, focused on comfort above all else, powered by a smooth V8. Cadillac doesn't make anything like that today, which is a shame, because that was the attraction for me.
I've put about 1000km on mine over the last two weeks, mostly highway, and it's just a pleasure. A co-worker riding shotgun asked me what I'd replace it with, and I really don't have an answer. I like the 2-door ATS with the 3.6L, but it's a dramatically different car, superior dynamically, but doesn't have the size, comfort or presence of the big ole DTS. No interest in a V6 powered XTS, and even less interest in the ugly CT4/5/6 with their gruff 4 cylinders, or the V6 options.