I bought a 200 pack of the Medical Personas a couple of month's back. At the same time I bought a slim adjustable. I was learning the slim and tried the Personas at the same time. I was underwhelmed and was even of thinking of trading them. This week, I retried them in my go to razor, the Red Tip. I have had great shaves all week. The lesson I believe is not to have too many variables change when evaluating a product. I am glad I did not get rid of these now. With the scarcity of the Iridium's now, I now have a viable back up.