I've found them insanely sharp. They make exceptionally light work of anything in their way but I, personally, found them harsh on their first use. They mellow out wonderfully thereafter. Considering I touch-up my cheeks and shave my neck, the 'harshness' had to be respected.
Comparing with my recent trial of a Gillette Nacet, I found the latter much more 'throwable', i.e. you can plant it anywhere on your face with a relatively aggressive razor and not have too much worry. I had potentially my best shave yet with the Nacet, to the point where I wanted to shave last night and this morning but have absolutely no need to. Bit stubbly, yes, but still looking respectably sharp!