I got a pair of these for my kids. I gave them plastic ones first, but they drop them on the floor and at least the ones in plastic I got couldn't handle the lightest step on them before they broke. These metalltic ones can take a pretty severe beating without a dent.
One downside, especially if you give these you young kids, would be that there is no protector for the membrane and tiny litlle fingers could easily break it. It has not happened yet, for me, but I'll probably get a few spare membranes just in case.