The size was my error. I thought I had a 22mm deck on my mod but it turns out it's 23mm, so the v2 is 23mm at the base. I find the flavor of the v2 is about the same as the v1, so you won't be missing anything in the flavor department. I do feel the v2 produces a smoother vape though.
I read a bunch of Facebook comments on the Uwell page about people complaining they only get 1-3 days coil life on the v2. I have no idea what they're doing wrong but so far I have 8 days on my coil and it's still going strong. I always had good life from the v1 coils too averaging 3 months out of them.