Yea I don't mess with aspirin. People here are under this impression that it's some extremely important harmless tab that will protect you from death. I glanced at some articles here and there that have come out, such as the one you posted, and decided it's not for me. Nattokinase seems like a better option.
I'm by no means an expert...however on a life-extension board I also frequent, many of the people have written about aspirin's anti-cancer type properties, usually with medical journal types references supporting themselves...