Added one more video, cutting 10mm (3/8) aluminium bar stock with 6mm cutter at 100mm/min (4"/min). I do not want to risk to break the cutter so I cut quite slow. Did cut some parts in 1/2" aluminium in one go at 4"/min, no problem at all. Surfacing leaves a beautiful texture because of the center dome.

http://www.youtube.com/watch?v=fZVT8ORdQu0

I have excellent results in acrylic, MDF and ply. Just finished my new vacuum table for my small router (2'x3') and will try to make a video with the different materials.