Although the CSL TM137U is not bad - if you do not at the same time anchor, would one even noticed anything negative - it is the anchor of my "favorite". Because she has more grip and for the reasons mentioned above.
In general, I am very pleasantly surprised by the vertical mouse wonder also, why that is not now commonplace. It performs much smoother movement. You can tell that there is no more pressure on the wrist or the shoulder. You feel no tension in the arm more. And the navigation is as smooth as with a "normal mouse". The "Back button" inside the mouse when surfing is really convenient. A real familiarization time did not exist. I immediately got away with it rightly.
The CSL TM137U I will use in my work, the private anchor.