Instruct: Classify an Amazon review as either positive or negative.
Query: Not sharp - not at all the Mach3's I'm used to

These blades are not sharp and shaving is just painful.I should have paid more attention to what the other reviewers were saying... I've been using Mach3 cartridges for many years and I strongly believe these are, indeed, NOT the real deal. Extremely disappointing, considering they're sold directly by Amazon.Buy at your own risk; mines are going straight to the garbage bin.