I first saw this product at the dog park and was interested in finding a frisbee for my blue healer that would NOT cause friction like the "soft bite floppy disc" we have been using. This friction cause by the nylon weave files her cannine teeth and because she loves frisbee so much we play 5 to 7 days a week for excercise. I have taught over 300 plus dogs over the past few years frisbee with this "soft bite" mentioned above and figured when I saw this frisbee by called Zisc by West Paw Design...I thought it would do well since the guy who was tossing it to his dog let me try it....It does fly well...but, because of its heavy weight and square edge....the dogs have a very very low percentage of catches because this Zisc "bounces" right out of their mouth upon impact during the catch...unless the dog catches it with the perfect angle...speed...etc. My dog is an AMAZING athlete and can catch the "soft bite" nylon fabric frisbee no matter how it is throw...she even flips backwards if the wind catches it and take it back....but, with the Zisc if the wind catches it and takes it back then the Zisc drops like a heavy anvil and hits the dogs mouth with too much force. Also, due to its design it is difficult for the dog to pick up on firm surfaces. This frisbee lost its luster within 20 minutes my dog did not want to play with it. I tried again the next day and the same thing happened my dog made several attempts to catch it and due to the low percentage of successful catches...she would drop the Zisc and walk away from it....which is absolutely unheard of with my blue healer...this dog will play and retrieve until my arm wears out. My dog and I tried the KONG one finally after having problem with the Zisc....the Kong one is shaped better...fly's better....at she is able to catch it without it bouncing out of her mouth....KONG offers a smaller thinner version for puppies which is the one she seems to like the best...it is lighter and more supple and she is back to making dramatic aerial catches again. Maybe it is due to the fact that she has a smaller mouth then a lab or a golden and maybe this Zisc works better with a bigger dog with a larger more powerful mouth....my healer is only 45 lbs...so that is something to consider. I noticed personally throwing the Zisc that the outer edge bends too much during my throw and when the dogs siliva gets on it...it tends to slip out. I thing the material it is made out of is only "semi" durable because I bought one of the balls too and my other dog...Aussie Sheperd took little chunks out of it within 10 minutes of playing and chewing on it. I have NO AFFILIATION with KONG...but, I find their material to be way more durable, but only in that snowman shape original toys.....that's my opinion and my experience...good luck finding the right toy for your dog.