Hot Hardware published a review on the Logitech MX Ergo Wireless Trackball: Untethered, Precision Mousing
A quote from the article:
Trackballs were all the rage a couple of decades back, when mice weren't nearly as accurate, maintenance-free, or ergonomic as today's offerings. Logitech was a leader in the space back then, and had a handful of popular trackball designs in its line-up, including ? my favorite -- the Trackman Marble. But over time, their popularity waned and mice got infinitely better.Logitech MX Ergo Wireless Trackball Review: Untethered, Precision Mousing @ HotHardware
Although trackballs never really went away completely, Logitech made some noise recently with the introduction of the MX Ergo. The new Logitech MX Ergo is a modern trackball with increased accuracy, a comfortable design, and lag-free wireless operation complete with a long lasting, rechargeable battery...