With a tournament coming up this weekend and several months of throwing the Axis under my belt, my Vectors are still my go-to mids most of the time. My most used Vector is about the same stability as a new Axis, but it turns much slower and is less affected by headwind. It doesn't fly quite as far or as low as my Axis, but it's more predictable for me. I'm using my Axis when I need more turn, more distance, or a lower line. The Vector really does season like a Roc in terms of losing LSS and keeping good HSS. Mine pushes into a touch of high speed turn after about 280, but it turns so slow it rarely changes the line unless thrown flat. Inside 280' it just holds it's angle and glides like a faster Ion.
I'm really looking forward to getting a lighter Axis so that it has a more defined role and overlaps less with my Vector.