I have the AP Mach2.
It has no backlash, perfect tracking, no meaningful PE, can easily carry my 27Kg Honders astrograph and can be driven with a PC, Mac or iPad, via USB, Bluetooth or WiFi....but I also use the AP hand paddle.
It is the most precise mount I have used to date.
The only downside is you do have to wait a bit to get one.
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