It's a great hold for kid and hardcore climbers.
As a children's hold, the cap of the mushroom has two distinct ledges and is crowned by a sloping section. The stem is a wide pinch that is most comfortable with the right hand.
Upside down, it's a huge mushroom jug climbing hold. The whole 11 inch distance that the lip travels is a rounded jug. You get two and a half fingers pads all the way.
This is definitely the favorite of the bunch. Slopers, pinches, double handed jugs...the list keeps going. I wouldn't just buy one. I would buy several.
It is plausible to set a whole boulder problem using copies of this hold in different orientations.Maybe even a mantle problem? It's possible.