I love it. I geared it 1.8 to 1 so I am getting just shy of 5400 rpm at the spindle. The motor claims 3000 rpm max and I get just a little less than that so the max speed I usually run is 5350. If I was doing it over I would gear it 2:1. I added a index signal on my spindle and that plus the quadrature output from the DYN4 drive for the A&B signals enables me to do ridged tapping which was also one of my goals with the upgrade. The new motor and belt drive is a lot quieter than the old motor going through the metal gears.
You can see some pictures here:
www.cnczone.com/forums/x3-sx3-g0619-g046...82-cnc-software.html
John
