I will start with the positives by first mentioning the (in general) good build quality. The keys, although quiet, provide a good feel. The software is good and helped me adjust the mouse accuracy to my satisfaction.
But...
1. I use three other Logitech mice daily (M705 Marathon, G502 Hero, and MX Master 3S). I easily got used to all the others. I can't get used to the M650 no matter what. It is small, light, and its symmetrical/ambidextrous shape doesn't help at all. I know there is also an L version, but I thought its size would be similar to the other Logitech mice I have.
2. The scroll is mediocre. The supposed smart scroll doesn't come close to the speed of the M705 and MX Master 3S. Also, it is the only Logitech mouse (out of the ones I have) that has a plastic (or rubber?) covered scroll wheel, which gives a strange sensation. It feels like it "sticks" to the finger. Even the M705, which has a plastic scroll wheel, has metal edges and provides a much better feel.
In the end, the mouse does its job well, but for me, an M705 would be a better solution considering it is around 10€ cheaper.

I bought it after my Dell MS5320W broke (its wheel got stuck).
It looks good, just be aware that this specific model is quite small in size. It's slightly bigger than laptop-style mice and slightly smaller than classic desktop mice.
You can get the L version for a slightly larger size.
The buttons are extremely quiet, perfect for libraries, schools, etc. I personally like click feedback, so I didn't like this.
The feel of it in the hand is very good, with soft surfaces and very good overall responsiveness.