If you get the Hepa filter for the Fein, it makes it as expensive as the Festool, almost. I've had no problems with my Fein,,, yet, but I agree with you that there is not enough price difference to not go with the Festool. Being certified,,,, not sure that means much to me, other than maybe Fein didn't get it certified, maybe they were late for the test,,,, but the Festool is a little quieter, and maybe could last longer, I don't know. But my Fein is, so far, serving me well. I do not have a Hepa filter.... I am 75, I smoked for many years... is a Hepa filter going to save my life..... I'm just rambling here. I can't say one is better than the other, I think maybe Festool is better, because everyone say so... I have never even touched a Festool product.... I would really like to, but I am not paying for one to just leave to my un-interested kids, in a few years, they would sell it in an estate sale for like $20.....