My SIL gave me a couple things of unopened puffs she had leftover. I don't think they work very well as a starter food. DD knows to pick them up and put them in her mouth, but she doesn't really use a pincher grasp yet, she grabs them with her whole hand, which is inevitably damp from drool, water, whatever. The puffs stick to her hand and she can't get it in her mouth. We've had better luck with little bits of chicken, veggies, etc.
Re: Puffs suck as a starter self feeding food
I found their small size to be a bit tough... instead, we have these "baby mum mum" rice cake things. He loves them, and they're nowhere near as messy as teething biscuits.
DS also loves carrot sticks and lightly steamed broccoli.