I have always advised buying intermediate priced router bits for a home shop, and replacing them with higher quality bits if you wear one out. It's time for me to follow my own advice.
A few weeks ago I was working on a project that required cutting a number of 23/32" dados, 1/4" deep in birch plywood. I was using a Festool router and guide rail and a Woodline straight bit from their Master Dado Set. Along the way, the bit started leaving fuzz at the edges of the dado. Upon examination, I saw that the bit had developed a small nick on both cutters at the top of the cut. I completed the project using my table saw. I called Woodline the next day. They sent me a replacement bit and I received it in a couple of days. Great customer service. Great limited lifetime warranty.
Today I used the brand new Woodline bit on another project, cutting the same 23/32" dados, 1/4" deep in birch plywood. After cutting less than 50 linear feet of dados, fuzz started to appear - again. Examination of the bit showed small nicks in the carbide, at the top of the cut. Bummer! Same problem with a brand new bit.
In fairness, this is the first time I have experienced a failure of a Woodline bit after a short amount of use. I have quite a few Woodline bits and they generally perform well. Cutting birch plywood is evidently hard on these bits. I was careful to make the cuts slowly to avoid damaging the bit - didn't work.
Tonight I ordered a Whiteside bit from Holbren to replace the prematurely worn out Woodline bit.