I use the Stainless PTFE blades almost exclusively, mainly because I'm too lazy to remove and dry the blade after every shave. Like others, I've noticed that they are a little harsh for the first couple of shaves (but not what I'd call "horrible") and then I'm good for a week or more of smooth close shaves.
I just got some on razorbladesandmore.com too and I rally love these blades way more than what I've used before.
I've used the regular SS which were horrible and the CVS carbons which were a little better but not great like the PTFE's.
I can use one blade in one week where as the others were like 3-4 shaves. These that I have left will last me awhile since I don't use a SE razor all the time. I've got 47 blades left so that's basically 47 weeks.