I was looking for a mouse recently. My priorities were:
- Comfortable (i.e. vertical; after getting used to it I'm not looking back)
- Standard format replaceable battery, since built-ins always end up depleting or swelling and being hard to replace
- Nice scroll wheel (highly subjective though)
- Easy switching between Linux and Windows systems
- Small-ish, portable
I got the Logitech Lift. I am pleasantly surprised by how nice it is.
Granted I mostly use my mouse for browsing, scrolling and navigating UIs. The rest is all keyboard. For games I prefer controllers and game pads so precision/high performance wasn't an issue for me at all.
I've heard that some laptops with magnetic closures register their lid as closed when someone with a magnetic wristwatch puts their hands near the keyboard!