Got mine yesterday and first off, it is an awesome design and already a new favorite. Even knowing the dimensions ahead of time it's impressively compact, and F&F is 100% on point.
In terms flipping the wheel is definitely rougher on the finger than a tab, but mine flips fine. With index finger I go closer to the first knuckle than the tip, thumb is probably easier once I got the hang of it though. I will say if I try parallel pulling out towards the nail with my index, or apply too much downward pressure in general really, it won't budge and definitely doesn't feel great. However, with more of a front-flipper motion, pulling out and away from the handle vs. pressing into it, it's been fine for me. A little wrist-flick comes with the motion too which helps with such a light blade. My experience at least.
Edit: After a day of moderate flipping it's smooth in any direction, seems like it just needs a short break-in period which is more noticeable with the flipper texture.
and Mr. Alexander for another unique winner!