I bought one to try out from a development point of view.
I definitely see it as a great accessory if you need precise rotation for a tool. It has much more position per full rotation than typical mouse wheels, so as a thickness or hue selection tool, it's great.
However, the ability to switch between modes by press-and-hold is much slower than just using touch or keys if available. So while I can see it as a complement to the Pen when you need mouse-wheel-like control and have no other input device, as a desktop accessory it really only makes sense to finely tune a single tool.
I would like to see them support it as a mouse-wheel when combined with mouse-emulation of the Pen for apps that need the wheel. While they do support scrolling, they do not have a mode that simulates the mouse-wheel and let the app handle it as such.
This feature would make the Pen+Dial combo 100% compatible with apps that expect standard mouse with wheel. (You can upvote this idea at
https://insider.windows.com/en-us/fb...8ee45c2&form=1 )
A larger version with a palm-rest that provides direct button access to the different modes instead of having to press-and-hold, such as what 3DConnexion is doing, would greatly improve its usability.