A punch cut gives a tighter draw and keeps the cap intact, which suits some cigars far better than a guillotine. This is Xikar's take on the tool.
A gentle pull exposes the sharp blade, and the cut is clean rather than torn. Small enough to live on a keyring, well made enough that it will still be there in ten years.
Punch cutter · Retractable blade · Keyring-friendly · Available in black, silver, gunmetal · Xikar lifetime warranty
If you have never punched a cigar, try it on a torpedo. It changes the draw entirely.