I'll have to look at what I was using before Pegas...but I couldn't cut a straight line to save my life. I would have to turn the material 30-40* to try and cut it. I switched to Pegas MGs and have no trouble cutting straight now. Don't know the detailed geometry behind it, geometry makes my head hurt, just want to make nice easy cuts.
I don't seem to have the touch, or pay attention with my music cranked up, to know exactly when the blade dulls and should be changed. I change it when I notice I'm pushing it a little harder. I start a pattern with a new blade, most of the time, and if I'm pushing harder or the cuts are a little "fuzzy" I change. When I get ready to cut the piece away from the main board I put in a fresh blade. The only blade breaks I notice are when I've left a #1 in for a lot of cutting. All this applies to straight blades...Don't think I've ever left one of those "evil spiral blades" in long enough to get dull!
That being said I would be open to trying a dozen of something else if it cut straight, turned sharp, and didn't splinter.