It is super easy and tastes great. However, I rarely do it on my grill for the same reason I rarely bake potatoes on the grill. For me personally, it is a time management issue. Roasting garlic takes somewhere around 30-45 minutes depending upon heat, size etc. As a normal course of things, I don't do a lot of things that require long cooking times on the grill. For that reason, it is much more convenient for me to do things like that in the oven, but that is me.