I was thinking of getting a mid-sized router for dovetails, and have
narrowed it down to the Bosch or Milwaukee. How do you find the Bosch for
backlash?

Not enough to be concerned about. You turn the knob it moves. That said
however then the lock lever is released, the motor can move a slight bit.
If you adjust the lock lever tighter a bit the base does not open as much
and the motor tends to not wiggle much when releasing the lock knob. Do
no over tighten as this may increase backlash. Typically though
increments of 1/256" is not a problem at all.

That's good to know. Thanks.