I tried the Pegas blades on my Seyco and Pegas, and no matter what I did, I continued to break blades. I always try to determine what it was that I was doing wrong before I blame the blades. I then tried the Pegas blades on my old Type 1 Dewalt and while I still broke a few here and there, it was not as often. It came to my attention that the Pegas are tempered harder than other brands and with the Dewalt I was able to sneak up on the tensioning.
But in my opinion, because the blades are tempered harder, they may also be more brittle and the real reason I was breaking blades is that I am a bottom feeder and tend to slightly bend the blades as I place them into the pilot hole. I tried top feeding on a project and didn't seem to break as many but still snapped a few which as we all know can be nerve racking to say the least.
While I did like the Pegas Modified Geometry blades, I went back to using Flying Dutchman and that solved my problem. I still won't say that it is the blade that is or was the problem however. It seems to have something to do with the tensioning, or the way I saw.
The answer? Try a variety of methods and brands and whatever works best for you is the best way....no matter what anyone else says.