Review on Perixx PERIMICE-804 Bluetooth Vertical Mouse - Wireless Connection For Windows & Android, No USB Receiver Needed by Kristopher Tight

It's good in the hand, but the rubberized coating they used for 90% of the touchable surface gets gunky after a bit, and is difficult to clean. There are also two buttons in the "thumb canal" that default to "browser forward" and "browser back" - I didn't look too hard, but on initial inspection, there doesn't seem to be any way to change that, and nothing is mentioned in the documentation.