Excerpt: This mouse has a lot of buttons. With my medium sized hands the mouse fits like a glove. The third button placed under the ring finger provides nice support too. The frame is a little week and can flex preventing top button presses if you grip it to hard. My only real Con on this mouse is the Logitech software. The software is a little glitchy and can sometimes jump in and out of profiles at system restarts or resuming from sleep.