We had a petrol 1 series (isn't the X1 based on that?), only issue we had was my wife didnt use it enough (or so we were told) and it tended to clog up its sensors from time to time.
the 2.0 diesel recall is for the ERG valve and each car is being fitted with its own specific replacement valve apparently, its not a generic valve they order in and replace, my guess is that it is generic but they are recording which one (serial number?) goes where, I should have thought a new car would already have had the valve replaced, otherwise it might be a long wait.
The 3 series I have just bought had its valve done just before I picked it up, the 4 series I was also looking at was on a wait list and the dealer had no idea how long it was going to take so they weren't even allowing test drives.
Our 1 series M sport had run flats, as does my current 3 series M sport, both on 18's and the 3 rides much better than the 1 did. The 3 diesel is very good on fuel/performance, the petrol 1 less so, felt a bit breathless tbh.