There can be a little turret movement when you load the die up. But it is very minimal and consistent. It it not flex, but movement with the clearance between turret, bushing and cap bolt.
If you lap the bushing (reduce its length) on a flat surface and 600 sandpaper, you can reduce this to almost nil. Just leave enough so you can tighten the cap bolt and still rotate the turret.
I really like my T-7 and it produces great ammo.