I can't believe no one responded to this video yet, so I must speak. In the very recent past it seems as though alot of endmill manufactures were making the "high feed" carbide tools, four flute torroid tools to take advantage of the whole "chip thinning" theory. I sat thru many machining seminars from Makino, Mikron, Hermele just to name a few, and I watched each of them rough out cores and cavities with these tools, taking tiny .01 depth of cut and hauling ass feedrates. I have followed in their footsteps on our 5axis machine, roughing 3d mold core and cavity blocks in the neighborhood of 300-400" per min feeds. Tool life was excellent and predictable, roughing close to net shape was easy and things were looking good. Now guys have jumped on the variable flute bandwagon like in this video, not as fast of feeds but HUGE tool engagement and depth of cuts. I would have to say if you have the choice, this is most certainly the best way to rough material, using the side of the tool. The harder the material is, the more likely I will cut this way, plus it's fun.! watching the chips fly without a hint of chatter is impressive. I have not tried SGS tools for this but I have had excellent luck with Emuge's version. The only downside to this strategy is if you have a heavily contoured 3d shape, you leave rather large steps behind, so the flatter the part is your cutting, the more this becomes a better choice. Also it allows for huge metal removal on a machine that's not too likely to feed at those abnoxious speeds, so older machines can enjoy this as well. Very good video and I'm glad to see someone actually use these tools they way they were designed.