Is the Grenade an actual shot in your books? As I am not the greatest putter I use the Grenade to lay up for an easy putt or to go under brush/brushes, much to the dismay of freinds. They always make faces when I throw one :-/
lol... I believe the Grenade is an actual and legitimate shot, but if you're 10-15m out, it might be better to try to "float" a putter, which at least gives it a chance of going in? That is all we're saying, but the Grenade is a safe shot, and something you might see me do during the Perth Open (maybe!!!).
I use it when neccessary. In 2005 at the Mid-Nats I used it 6 times
..each time saving a stroke, including parking hole #7 blueberry hill off the tee! It can hurt real easily, so don't field practice it. Easier to control than overhand shots for some.