I have one.

There are two trigger systems available (and field alterable). One is the staged release, that requires a specific state machine sequence for each nail. Great for newbies.

The other, which virtually all pros use, is the simple touch and trigger mechanism, which fires whenever the trigger is pulled AND the tip is in contact with something.

When learning to use the latter, I frequently fired 3/4 nails in rapid succession.

Cheers