The PM-30 has Tapered Roller bearing stock. They are a strong bearing but will make a lot of heat at higher speed. Most all the bench top run them.
Breaking takes a long time lets say 20 hours. If you have the preload sett correctly you can run 4000 to 5000 RPM and not over heat on long runs.
The stock RPM is 3K and getting to 4 or lets say 4500 should be fairly easy. For faster you will want to go to new AC bearings and really, if you run larger cutters at all, a larger motor. The 30 is just large enough to fit a 56C size motor.
The 30 does give over 8" of Y. It is a nice move up from the mini mills.
I also make a kit for them.
Thanks
Dave