I just bought the Logitech mx ergo a month ago. works like a charm with Linux and is all around the best trackball I ever had, been using them since nearly 20 years.
Alway went for the Logitech "trackman"-design, I never managed the one with the ball in the middle, always move the ball with my thumb.
I also use it for gaming, counterstrike etc. works like a charm. I went through hard time tho. The white trackman with the red ball was an absolute classic, sturdy as hell and really nice to handle. I went to the grey one, also with a cord, but it did feel much cheaper. I then went to the cordless trackman wheel i think which was wireless for the first time. I upgraded to the m570 with its unifying adapter and while i really liked it, the built quality was garbage aswell as the button clicker. I had 3 of these pieces of shit. After the third one started to make double and triple clicks a stopped using a trackball for the first time in over 19 years. My life was ruined. I hated my computer, I just wouldn't use it as often. But lo and behold, the kings returned and brought the MX ERGO and this thing is the shit I really love it. It brought some long needed progress to the trackball game. the build quality feels very nice, this thing is heavy and sturdy oh my god it feels so good to touch this thing and rub its ball. stylish grey with a matte design, I hope it lasts forever. Bluetooth integrated, switching between my two machines without having to disconnect, precise mode for gfx, scrolling wheel with left and right-click, I just hope they used some high quality button clickers this time and OH LORD LOGITECH please don't disappoint with a battery that only lasts a year. But anyways, after going nearly a year without a trackball and just a regular optic red light having piece of shit mouse I'm finally in heaven again and the mx ergo was the best way to embrace the renaissance of ergonomics.