Review on Amana Tool 46020 K Spektra Compression: Superior Cutting Performance for Precision Woodworking by Souly Buddy

The most durable bits I've ever used! Holds sharp edges for 2-3 months with heavy half-daily use. I like the very short cutout for stained plywood. The only downside is that even at 1/4" to 3/8" of travel it screams like a banshee. Although I always make a final pass to clear up any chatter.