I make a lot of purchases - about a third of them are 'duds' (from all the stores). I've learned to sit back and wait a while before I jump. I've only had one chargeback in 7 years, and to be honest, I grew to love that vendors products. I'd be bounced out of here if I asked for a refund on all the losers i've bought. I also use the harshest light set up (3 lights, black, grey, and white) and if the product can pass that test it's a winner.