i use feathers and normally get 2-3 shaves per blade
Some blades don't "mellow out" until the second shave.....
I agree with turtle and rgeudy. My second shave is always better than the first. I use Blue personnas and I get three shaves from them.
As usual YMMV
I think most blades are inexpensive enough to ditch after one shave. Except Feathers and a few others (those are a bit expensive). Even if a blade costs 20 cents, I think it is still worth using a new one each shave. Still only $6 a month in blade (shaving everyday). That is damn near the price of 1 fancy 5 blade cart razor.