Perfect detail finish. Just make sure to use them very slow and with a good RPM. I'll take shorter tool life for a very clean cut and no breakages, over going too low on the RPM and breaking the tool. Very fragile.
Leaves a fantastic finish on acrylic versus standard general purpose. Still to work out exact settings for difficult materials like PP but eliminates melting onto end and improves surface finish. Used with CNC-Mini engraving machine for detail milling - great combination