Took a bit of work to get Bluetooth to find this mouse and connect, but it finally did and it's fast. Much smaller than I anticipated. It's totally hidden in my palm. Took some getting used to. I just purchased it for general work, no gaming here. It does the job I got it for.
I like it, but sometimes it can take a bit to reconnect to Bluetooth. Some people will find this unacceptable. I still like that it doesn't take up a USB slot.