Just got it from Amazon ($80.95 delivered) and did the techie geek thing. I got a piece of 3/4 birch plywood and cut 2 sides (rip and xcut) with the brand new (did maybe 10 cuts on it) Delta 40 tooth thin kerf balde that came "free" with my new saw. I then put the WWII on and did the other 2 sides... as they say like butta.
The cuts are super smooth and it took much less effort to feed. Amazing!!! Worth the 2x the cost of the other blades I have bought.
I guess I am finally learning, buy quality and cry once...