Well, right now, I'm focusing on the Oddball Blankets and Oddball Shawls we're making. Those are made with regular knitting needles.
I tried using the Knifty Knitter, and it's obvious that I need to use very thick yarn, or double-stranded worsted weight yarn. Otherwise, the knitted item turns out very lacy.
So, I'm thinking I could get my piano students to make some thick hats for charity.