I do some CNC work so I use a lot of quarter inch bits as that's one of the most common sizes. use. It's amazing how a stripped down $40 beat only lasts a couple of sessions and then wears off. Lately I've switched to 2 flutes instead of the standard up or down cut bits. This particular lure is instantly much hotter than some of the others I've tried, Timerline, Whiteside, CMT. SMT is one of the worst. A session that lasted several hours became somewhat blunt. I'm happy to report that this is the leader of the pack at the moment. It sinks very well and just feels sharp after a few hours of cutting through oak. No burning. I typically use 12,000 RPM and lower the dive speed to around 20-25 inches per minute. In general, I find that slowing down the plunge speed significantly extends the life of CNC routers. It's not straight cuts that will set you free, but rather a swoop that can burn you up a little. I tend to add my bits of work where possible, but that's not possible with a lot of 3D work. This bit sinks very nicely and cleanly. Even better than some beats that cost three times as much. I highly recommend it. So far I have been very impressed with the Amana brand. I've used one of their spoiler boards and the results have been outstanding. I think I will buy more from the Amana brand. I've just ordered my second quarter inch bit to have on hand, but my current one shows no signs of dulling.