Purchased on Black Friday for €73.
First impressions. Small in size, typical shape, good build quality and quiet buttons. If you have large hands and work for long hours, it will tire you as it won't be convenient. It has excellent customization options where you can assign functions to its buttons for various apps. The scroll is not smooth enough and the accuracy is average, this is my main complaint (tested on Mac). It has many settings and maybe I haven't found the sweet spot yet, so that remains to be seen. As for its battery and the comments on the internet, as well as my own first impressions, they are excellent. Initial conclusion: If you belong to the category where the mouse is an extension of your hand due to your profession, this is not the mouse you want. On the other hand, if you want something for casual use, you can do your job equally well (maybe even better) with a cheaper mouse.

One month of use update: After a lot of experimentation with the settings, I managed to find an acceptable level of smoothness in movement and accuracy for my taste. It doesn't reach the level of the trackpad but it's close enough. The battery is excellent as it came with 40% charge upon purchase and it needed to be recharged one month later with daily but relaxed use. I repeat that the settings for the applications are the strong point of this mouse and maybe the main reason why you would buy it.
Conclusion: It is a quality mouse in terms of construction, decent in its use with its advantages and weaknesses. I add one star to the review but I insist that at €80+, it is expensive.