Got one. Construction is top-notch, wheel is tight and smooth, M1/M2 are crisp, M4/M5 are solid and vastly improved. Everything about it is great...
... except the sensor is top-tier trash. If you put the mouse down while moving it, about half the time the cursor moves in the opposite direction from the one the mouse is moving.
I'm actually impressed with how terrible the Blue Track sensor in this thing is. It's shockingly bad.