A bit difficult to get on, but that makes it hard for the little ones to get them off!!

It helps me hold a pen, reduces MY frustration a bit

The shape is a bit odd, but the instructions explain which surface your thumb is supposed to rest against

A bit hard to use

Expect some resistance at first since it will feel strange to them and they may complain that their hand hurts a bit until the muscles in the fingers get used to the new positioning.