This thing is great! I feel in precise control of my timeline while editing, and the build quality is pretty good!
It's nice to have mechanical switches on a device like this, however, I am really tempted to take it apart and lube them, but that's just me nitpicking!
One downside is that it can be hard to know how much battery life is left, and whether the device is connected or not. Most of the time the Speed Editor connects to Resolve automatically without issue, but when it doesn't, it's hard to know whether it just isn't being found, or whether it is out of juice. I'd like an on-off switch and some kind of indicator to know what the device is up to.
Also, I'm on my computer a lot, and just being able to let go of the mouse and use another input device, has been really enjoyable.