I love the Kensington Orbital, flicking the trackwheel has become second nature for scrolling through console output or long webpages. I do miss a middle button

I love the Kensington Orbital, flicking the trackwheel has become second nature for scrolling through console output or long webpages. I do miss a middle button occasionally though. I might take a look at one of these Elecom trackballs or the 'expert' Kensington with four buttons