This is one of my favorite shoulder pressing variations. It's not only a great way to spice up your shoulder workouts and hit your shoulders a bit differently, but it also requires some additional core muscle engagement in order to maintain the offset load.
Although you can certainly perform this exercise using a dumbbell, do it with a kettlebell because its design really works well for this exercise.
The boneheads in your gym only know one way to make an exercise tougher – add more weight. That's why boneheads never build more muscle, no matter how long they work out. Our resident Scotsman knows some remedies.