I bought a Micromatic not knowing anything about it because I'd never seen anything like it before, I like bright and shiny things, and it was only $3. Anyway, I was in the garage sitting at my bench cleaning it and thought to myself that my paint scraper blades would probably fit. So, I grabbed a blade and sure enough, it sat right in there! After reading some threads here about GEMs, I've learned they along with SE in general have a cult-like following. Anyway, is there a difference in the hardware store blades vs the multiple others and the ptfe coated?