First off these are about $10 bucks a piece cheaper than the 'official' flying disc, or whatevere it is they sell at Petco/Petsmart. Secondly they fly great, are very durable (my 60lb lab and I play tug of war for hours and nothing happens).
The only thing is that when left alone, my sneaky lab will chew this into little tiny pieces, so I go through about one flippy flopper every week or two. but that's why I buy ten at a time, which gives you free shipping, so apiece they are under six bucks, which is not much more than I would spend on chewy sncks, so it does double duty.
Highly recommend.