I usually buy Whiteside for bits I think I'll use a lot and Yonico for more specific things I'll use infrequently. I have beats from other high quality beat makers like Freud and Amana and while they are great they never seem to be as good as the ones I get from Whiteside. I've never used carbide bits like this before, but I'm very impressed with the original quality and sharpness (WEAR GLOVES!), and it's even better in use. It's so good for slotting that I decided to do a few passes with this bit instead of using the larger diameter straight bits (also with the white side) which I was very happy with. Great product, great price.