Picked up my 2021 SR+ this past Saturday in Toronto, and had a really smooth experience. In terms of fit and finish, there was really nothing to note as far as I could tell. I'll get some photos of it when we catch some sun here, but overall I'm quite happy with it. First drive with it, I went about 50 km in 5 C weather (~40 F), and with the HVAC on to a cool room temp, I spent about 12%. Keeping in mind that this was with Sentry Mode on while parked for a couple hours getting groceries and stuff, I want to say that my early sense is the heat pump makes a noticeable difference. My raw intuition, without doing actual testing gives me the sense that it probably allows you to get close to rated range down to almost-freezing temps. You can also definitely hear the heat pump at work intermittently, but it's not annoying or anything.
Lest this become a battery optimization post, I'll leave it there, but just wanted to provide my early experience of the feature I was most waiting for.