I've tried it on my shoulders.
It sorta-kinda works; it certainly doesn't feel bad, or anything! But I don't find it's really long enough to help me reach those hard-to-get spots, and the head flexes enough on the stalk--even when the joints are locked--to make putting pressure on any one sore spot in particular kind of frustrating. So I wouldn't buy it *just* for my neck or shoulders. I'd get something bigger and firmer, like the Ideal, for that.
I do quite like running it lightly over the soles of my feet, though!