I have lasers for two of my pistols. They are a wonderful training aid. With snap caps and lasers you can see how clean your trigger pull is. You can also point shoot from various positions without expending any ammo.
On a sick day a stripped frame with a laser and a couple of cats is a great way to kill some time. After seeing how some will immediately lock onto the laser and ignore everything else I would not think of venturing into big cat country without one! Don't know if it would work the same on a big cat as a house cat, but it could be very entertaining to find out! ( of course that experiment would be with a fully functional, fully loaded pistol, just in case)