I bought a Grizzly table saw a year ago. I was using the blades I could get locally at the box stores. I had scratch marks in the wood & the blades wern't "true" & after a few weeks use it was evident that the blades got dull quickly. I sucked in a big gulp of air & ordered a Forest WWII. WOW. The difference was amazing to me. I know I had spent over $100 on several blades, had them sharpened locally for X$. I have had the Forest on the saw for 8 months or better & it still cutting better than some of the new local bought blades. I'm doing my own test, leave it on for everything (mdf, plywood, 2" construction stuff) but NO junk & treated wood to see how long before I need to change it, but so far it still cutting great. I'll definitely send it in to get it re-sharpened when the time comes.
No scratch marks, totally glue-able surface, Rips 4/4 & 3/4 oak, cherry, maple. It shows no teeth or cutting marks that I notice. (I rarely sand the edges anymore & when urethane's applied I see no saw marks)
When the time comes I'll buy a new one, put it on & send in this one for sharpening.
From what I've noticed, the forest WWII combo 40 tooth standard kerf, is worth the $. http://www.librawood.com/forrestwoodworkerII.aspx
I've heard good things about the Frued Fussion but never used one.
Quality difference? Night & Day! Truely. IMHO (PS don't brush against the teeth when installing, or keep band-aids close)