Every thing about it works very well. It's comfortable and possibly actually as light as a feather. The charging is a smart little thing too. As usual, Swiftpoint knocks it out of the park. This is my second product, after the Z, and it's fantastic.
It is mildly uncomfortable after an hour's use when first starting out. Also, don't grip it tightly. That helped a lot.
I love this mouse. It is easy to set up and super easy to use. Makes it a lot easier then poking at my screen.