Overall, the mouse works fine and I have no real complaints about the sensor. My biggest problem is definitely the scroll wheel.
In free-spin mode, when I move the mouse quickly from side to side, the scroll wheel starts rattling and moving around inside the mouse. What is even stranger is that when I slightly lift the mouse, the wheel can move by itself and actually scroll the page. So when lifting the mouse, you basically have to be careful with the wheel or even hold it in place so it doesn't scroll. For me, that just makes no sense.
In the normal ratcheted scrolling mode, it is a little better. Scrolling down feels completely fine, but when scrolling upward, the wheel makes a noticeable rattling noise and feels much worse.
I specifically bought the Silent version because I wanted a quiet mouse. The main buttons are indeed quiet, but clicking the scroll wheel is surprisingly loud. I don't really understand the point of making a Silent version when one of the basic mouse buttons still makes that much noise.
The left and right tilt clicks of the scroll wheel are also not very comfortable. Tilting it to the left is still manageable, but to the right it is much worse because there is less surface area to catch with your finger and it requires too much force.
The shape is also not perfect for me. The hump is simply too high. If the mouse was around 5 mm, maybe up to 1 cm lower, it would be much more comfortable, especially for fingertip grip.
Other than that, everything works fine. My main issue is definitely the scroll wheel, because its quality simply doesn't match the price of the mouse. At the current price, I expected much better build quality. If this mouse cost around one quarter of its current price, I could say it was okay. At the current price — definitely not.