Best Tablet Holder

Why do I think this is the best tablet holder?  It’s all metal construction, including the clamp and screws.  It clamps securely to a mic stand. It holds the table securely, and is completely adjustable.  What more is needed? It is only about $20!  That works for me.  This holder is sold under a variety of brand names, Strukture and Lux being the most common.