Review on Ultimate Guide to KOWOOD Router Pieces for Woodwork Beginners by Brent Mosley

Can't say for sure how they keep their sharpness over time (I've only had them about 3 months) but I've used almost half the bit and they cut Great . The range had everything you need and a variety of sizes of each species. I personally have had very good luck with them and have recommended them to several of my friends!