This Trackball MX ERGO By Logitech

IS very impressive in feel and operation.
You can tilt the top over another 20% making it much more comfortable in the hand. it feels so good really and the best thing is I have it connected to the laptop through bluetooth and through dongle on the studio pc. I just click a switch on top and then i'm controlling the next device. operating two computers with the one is brilliant. BUT! I can program buttons on the trackball to do a list of over 15 operations. I programmed two of them to copy and paste, that is awesome as well, when you tilt the wheel left or right you move the track like a jog wheel. There other buttons on it you can program too i may program one of them to "cut" and see how that works. When i come out of cakewalk those buttons go back to normal operation. The programmed buttons are specific to whatever program your using. It's worth it to have supm like this in the studio, just thought I'd pass it on.
1Love

I use the Kensington Orbit Scroll Ring. I highly recommend it.

I had looked at these, but is not clear if it has hyper-fast scrolling (like the M705). With the amount of documents I work I cannot lose that functionality (I cannot find if that ergo scroll wheel is heavy brass and can be unlocked?). Scrolling 20 pages a second is priceless compared to a clicker wheel that might get you a page every 3 seconds, and give you carpel tunnel as an added bonus. Just how fast can the ergo scroll a document?

The other downside for me is the resolution seems incredibly low considering a trackball is static and should get finer control (although the ball is smaller). My M705 is 3x higher, and some cheap corded mice have up/down buttons for resolution to drive it all the way to 4000dpi (that feature is nice for detail work when you need to drive to pixel precision). The only trackball I ever used years ago was the size of a cue ball and I *thought* the resolution was better (may be faulty memory too).

@mettelus, the wheel is light aluminium and clicks permanently like with the M570.
The button switches between dongles, allowing you to use it with two computers.
It does not unlock the wheel to spin freely as you mention. Would be cool.
 
Incidentally, there is no way of knowing what the state of charge is before it's time to recharge.

Thanks for that feedback. The other thing that would suffice is if Logitech allowed a button to temporarily assign scroll functionality to the ball, but I am not sure if it can be done. It is odd for me that Logitech doesn't consider large documents in its functionality.

The big advantage of a track ball for me would be the static position on the desk. With an ultrawide monitor there is a fine line with resolution and windows pointer speed so I literally pick up and reposition my mouse often enough to notice. The mouse is horizontally challenged for cursor motion, but a trackball would be vertically challenged for scrolling. For folks with 3 side-by-side extended monitors, the horizontal challenge would be worse, I think.