I have always used genuine JZBZ queen cups. I am scheduled to graft Saturday and today I realized that I never ordered more cups. I highly doubt that I'd receive them in time from Mann Lake if I order right now. That is not a knock on Mann Lake, they have always served me well. However, I can get the chinese knockoffs from amazon on Friday. I'm NOT trying to save a penny here, just trying to save time. Has anyone tried these cups?