EQ3 is great for wide fields... 200mm FL max.
Eq6 is better.. especially if mounted on pier.
BTW, I had a look at uStepper S....
It is a bit of overkill for our purpose in some respect (it has uP, USB), and not adequate for precise tracking (clock frequency stability - I can't see quartz crystal anywhere, maybe it is not shown).
It is also not h/w or s/w compatible with OnStep, or AstroEQ or similar.
For my EQ6 (belt modified 1:5), I have stepper drivers (Pololu, A4988) and 400s/rev motors inside the mount.
Interface is STEP/DIR (via D15 connector, provides power from mount for controller as well) for both motors so I can use anything to drive it: onSTEP, Bartels, SoundStepper (all controlled with CdC or Stellarium),
my own driver (handpad with processor which generates 15ms pulses for tracking and faster pulse streams for slewing).
I intend to do the same thing to my Bresser/LXD75 mount one day.
The whole thing is very low cost, but reasonably high performance in operation.