The 4/8 size gets a lot of undeserved flak. I have a crazy beard that seems to beat the crap out of edges. (I only get 5-7 shaves out of a Feather disposable, and most guys seem to get 10-15.)

Some of the best shaves I've had came from 4/8 blades. They have a zippy quality to them that makes them work really well for me.

It's all in the honing, although there will be some variation from blade to blade.

Each blade size and grind has a very different feel, as the other guys have pointed out. But all should be capable of giving you excellent shaves with the proper honing and shaving technique.

Josh