Congrats Brian, they are a quality piece for sure
For those that do suffer some mirror shift during focussing, the "trick" to it is always focussing against gravity, i.e. so that your final move of the focus knob is pushing the mirror up...on Celestron SCTs, this is anti-clockwise. The micro focuser doesn't eliminate that per se, it just allows you to get closer to perfect focus with the first movement
