That’s funny I have the same mouse as you and just bought the newest one. I just don’t have the middle one like you have here.

It was actually a good thing I bought the upgrade. The old mouse on the very far left is barely responsive compared to the new one on the far right. they also developed the software for it to react a lot better. It’s also a lot quieter. Even on the side buttons. and the grip is better as it’s not so shiney to shoot out from under the hand.