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.