Bests & Worsts Reviews from Amazon

(see Update below) I bought this disk and the Cosmic Dog Disk on Amazon at the same time. I received them today and went outside with my Australian Shepherd and threw them around for a good 45 minutes. I have found out to NEVER only have 1 frisbee when throwing. If so, you will be playing tug-o-war with it and the disk won't last near as long. When your dog returns one, throw the second. Both of the disks are the same structure, i.e., a hard rubber outer edge with a soft inner circle. Here's my take on them both: Cosmic Dog Disk: Pros - Rubber outer circle is very durable. My dog wanted to shake this one like a maniac when it was in her mouth. The inner circle is thin nylon. With all the shaking and chomping, it doesn't show any signs of wear yet. Only time will tell. Once it's thrown, it stays in the air the longest of any of the 8 different dog frisbees I have bought due to its light weight. It also stays parallel to the ground very well with normal frisbee throwing technique. Cons - It's hard to throw very far because it's has a flimsy feel to it and it bends under the pressure of a high-torqued throw. You have to adjust your throw to a slower accelerated throw to keep it circular. ChuckIt Paraflight: Pros - This is really solid feeling. The outer circle is more solid than the Cosmic Dog Disk and the inner circle seems to be a canvas like material. It holds up well under the highest torqued throws. After chomping on it for 45 minutes, it barely looks used. Cons - As you can see in the video, all of my throws end up curving left very abruptly about half-way through its flight. My dog can still catch it, but it gets annoying after a while. My dog didn't seem to prefer either disk more than the other and she's VERY picky. Sometimes, if she doesn't like a frisbee, she simply won't chase it at all. In spite of the ChuckIt Paraflight holding up better and feeling more solid, I can't seem to adjust my throw to accommodate the crazy left curve. I prefer the Cosmic Dog Disk, even though I have to throw a little more slowly. UPDATE: After a week of throwing, the ChuckIt Paraflight is still in prime condition, while the Cosmic Dog Disk has a tear through it's outer rubber edge. I have upgraded this to 4 stars for it's toughness, but it still curves sharply to the left compared to all of the other frisbees I throw with my dog.