I have learned that all blades are not equal. Several years ago, I got a great deal on Ormcraft blades at a LQS. They were great--for the first couple of days. They dulled quickly, could not be resharpened (just became duller) and would get a nick if a pin was within a foot of them. Now I go with brand name and am much happier. My family knows that I love being gifted a pack of blades!
I found that no sharpener really works for me. Cutting thru a few layers of foil with my rotary or scissors, can restore some sharpness.