Just got my white ZA12 and it's so good.
+ Coating is great. It feels like the mouse has invisible gun tape or something. My hands sticks like glue to this coating, so my hands don't slip around.
+ Side buttons are super crispy compared to my red logo FK1. A lot less wobble and more click feedback. It just feels a lot better in general.
+ Scroll click takes quite a bit less force than my FK1, feels better to me.
+ The clicks feel a tiny bit lighter than my FK1.
+ The shape is so good, which is surprising. I hated the FK2 because of how narrow it was and the ZA12 is the same width. The hump fills out my hand and makes the narrow width a lot less noticeable. I can use pretty much all grip types on this mouse comfortably. If I palm the entire mouse, it feels like it was perfectly made for my hand. (Hands are 8inches vertical, and about 3.5inches horizontal)
+ Left and right click both feel like the same force to actuate.
+ It's so dam sexy. Easily the best looking mouse I've ever seen. The red logo actually looks really good, as opposed to how meh it looked on the black products.The red looked more like a washed out red wine color on the black models, but it really pops on the white shell. I love Zowie minimalist approach and design, it's like gaming gear for adults.
- M5 feels a tiny bit heavier to click than M4, not a huge difference or something that would bother me, but it's there.
- Same awful scroll wheel. I preferred the scroll wheel of my old yellow FK1. I wonder if I can swap it into my ZA12?