No really. The cheapest model they sell has a laser pointer targeting system. I think it costs all of 5 dollars, and as long as you press the trigger the laser light comes on. It's not as bright as a traditional pointer, but I've had friends who've used it non-stop for four hours without complaining. And since it's built for children so we just give it to the kids when they're bored. Keeps the kids amused for an hour or so and tires the cats out so they sleep all night.
Also, the darts will stick to a smooth ceiling or door and drive the cats even more bonkers.
And mine learned that the sound of the fire mechanism meant play time and will all come running whenever we fire off a dart. (It makes the noise even if there isn't a dart loaded.)
Heck, one of my mom's cats has become so trained to it that if you just point to the ceiling like you have the gun in your hand she starts chittering her head off!
Best cat toy ever.