I have an Orbit Fusion for the couch. I looked at the Elecoms, but I just really like the scrollring. In my perfect world there’d be a god-damned three-button orbit with scrollring, but in the meantime remapping the Fusion’s “Forward” button lets me use it with similar ergonomics. I notice the stiction, but it’s a very minor little aspect of using the trackball, and it’s not distracting enough for me to feel like I need to replace the bearings. I did do the “rub some nose oil on it” thing and that helped some.
There are a few DIY designs floating around that use BTUs, and some have certainly made their way into ergo keyboards, but I don’t know of a commercial product that uses them.
If it just had three buttons, it’d be perfect. As it is, I’m using the Orbit Fusion as my couch mouse, with the “Forward” button remapped to left-click, which lets me rest my hand similar to how I would on the “classic” Orbit.