Thought I'd share a video of my x6. Here is a finishing pass running full tilt.

100"/min, 2500 rpm (not max spindle speed), 6061 aluminum. 1/2" HSS ball nose 4 flute endmill.

"http://www.youtube.com/watch?v=vX_tnwjF2Ac"]YouTube- Syil x6 CNC - Finishing Pass, 100in min, 6061, mach 3

I'll throw up a good roughing video when I can.