This will be a subjective point of view. I find the mouse amazing. For professional use where I move around quickly throughout CS4, LR, this and that, it isn't built for comfort and precision.
In other words, it works but I have used far better mouse that provides comfort and precision without hesitation.
This mouse is great for normal day to day use for medial tasks. When you work long hours clicking away constantly in edits, whether video or photo, it's ergonomically designed and mis-clicks can occur.
Other than that, it's a wonderful mouse.