What does the mx ergo have or do that is worth $60 more than the m570? just a magnetic hinge and rechargeable battery?

Yes, yes, and yes!!! I didn't not buy this from Amazon because I wanted to get this right away. I went to Best Buy and got it. I have used the M570 and it was quite good. I had an older keyboard so first upgraded to ergo k860, OMG!!!! what a difference.... then I thought I should try the vertical mouse first. Returned this on the next day. Then I looked at the Logitech Master MX 3 because it had the most features..... Returned this to the next day because once you go a trackball, you won't be back to a regular mouse. Then, before I decided to try MX Ergo, I thought I should just keep m570 because it was better than the first two: vertical mouse and mx master mx3 but then I thought it wouldn't be fair to not try MX Ergo. I AM GLAD, I DID!!! your wrist is going to be thanking you for years!!! Love it! The programmable features are awesome! I work from home and this is must to have nowadays.

Does this have the same crappy microswitches that will cause click failures in mere weeks for which your M570 is infamous?

I use mine (M570) for graphic design 8-12 hours a day and yes, IT DOES INDEED HAVE CLICK FAILURE. At one time I had one of our IT staff take it apart and make adjustments to the switches, but the problem came back again in a few weeks. REALLY frustrating when trying to drag and drop objects in a layout, or draw, or even getting a consistent smooth performance for merely highlighting text. It's a legit concern. I need to replace my M570 and am looking at the MX ERGO for the very same reason, but the $100 price tag seems hard to justify.

Does the mx ergo have the super fast, gearless “freely spinning” wheel like the mx masters?

No "free wheeling" but a simple mod will make the wheel spin freely. I did this on mine after a little apprehension at first. Not sure if will be easily reverted to tactile "cog" movement but it suits me.

How well does it work with Linux?

I'm using it with Linux right now, and everything works pretty much as expected. I'm using the Unifying Receiver on a Fedora 28 desktop with X and Bluetooth on a Fedora 29 Beta laptop with Wayland. Everything works on the laptop, and everything but horizontal scrolling works on the desktop. I'm not sure if the difference is X versus Wayland or Unifying Receiver versus Bluetooth. Solaar reports the battery status and easily let me pair it with the unifying receiver I already had on the same machine. It lists two buttons that it doesn't recognize, which I think must correspond to the DPI select button and device switch button. Those work, though, so I don't really care that they don't show in Solaar. Bluetooth also reports accurate battery status in the Gnome control center.

Wireless Type	2.4 GHz Radio Frequency
Average Battery Life (in hours)	4 months
Brand	Logitech
Series	Logitech MX ERGO
Item model number	910-005177
Hardware Platform	Laptop, PC
Operating System	Windows 10,11 or later,Mac OS X 10.8 or later,iPadOS 13.4 or later
Item Weight	5.8 ounces
Product Dimensions	3.92 x 5.21 x 2.02 inches
Item Dimensions LxWxH	3.92 x 5.21 x 2.02 inches
Color	Graphite
Rear Webcam Resolution	4000 MP
Power Source	Battery Powered
Batteries	1 Lithium Metal batteries required. (included)
Manufacturer	Logitech
ASIN	B0753P1GTS
Is Discontinued By Manufacturer	No
Date First Available	August 23, 2017

Logitech MX Ergo Wireless Trackball Mouse, Ergonomic Design, Move Content Between 2 Windows and Apple Mac Computers (Bluetooth or USB), Rechargeable

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