I got one by accident. PO-13. Very fun device. I can use it without a reference, no problem. I'm a bit hesitant to give one as a gift for a child, though. OP-1

I got one by accident. PO-13. Very fun device. I can use it without a reference, no problem. I'm a bit hesitant to give one as a gift for a child, though. OP-1 had lots and lots of visual feedback, which facilitated learning and experimentation. I wish they got back to that philosophy of design.