I have a set of the 380 oz-in NEMA 23 steppers (4.1mH inductance) and now a set of these 320 oz-in (2.8mH inductance) motors. I'm driving a 3 axis Router with 10mm lead ballscrews and a Mini-mill with 20 TPI steel nut leadscrews. The issue with steppers is always the drop off in torque with speed due to the back EMF caused by the inductance. Long story short these motors with the lower inductanc extend the torque out to much higher speeds! I can run my mill and router about twice as fast with these motors and they run much cooler.
Love the quality of the CNC router components...especially if you have a G540.