I have been using the Schick Hydro 5 on my dome since i went sly a little over a week ago. I was curious to how long they usually last before they aren't as effective. They are very expensive, about 12 dollars for 4 refills, that is simply too much.
I have tried the Mach 3 but it just wasnt as close as I had to go over some spots multiple times and was afraid of irritation. As for a 5 blade vs 3 blade in terms irritation, I dont know if 5 blades going over your head gives you a closer shave but more irritation or if 3 blades gives you less irritation but not as a close of shave.
I am an every day shaver and cannot keep up the the cost of the Schick 5s, i have been using a new one every 3 days, but I am pretty certain that is too frequent.