Excerpt: I chose this mouse because I was having trouble with tendonitis in my thumb and this looked like the best design to help alleviate that. Honestly, when you are drawing masks in Photoshop around a detailed objects for hours every day like I was doing I don't think any mouse will stop you from that repetitive motion injury. I considered a trackball but I've had one before and am not a big fan.
Excerpt: The mouse is working fine I bought it to replace and "retired" older mouse. I like the feel and shape, but am still trying to determine what the buttons on the thumb side are supposed to do. No instructions and so far, I don't see the purpose. However, it works great for the casual home computer nurd!