Okay, let me start off by stating that these discs are absolutely the lowest quality you can get, which is reflected in the price. First of all, the plastic they're made from is extremely hard and stiff, and also feels very low-quality. I highly suspect they will shatter on impact with anything hard. Secondly, this pack only contains TWO types of discs. The sparrow and albatross are supposed to be a mid-range and a driver respectively, but they are 100% identical in both weight and shape, and it's obvious they came from the same mold. Speaking of molds, these "drivers" are not properly shaped. A proper high-speed golf disc has a lip running around the underside of the disc that extends downwards. Depending on the speed of the disc, this lip can be very shallow or very pronounced, with mid-range discs typically having the most pronounced lip. This lip serves to keep the disc stable as it flies. These discs have NO lip at all (the bottom rim is completely flat), and because of this, they are so under-stable that they are worthless if thrown with any significant spin, as they will immediately pitch hard to the right (for a right-handed backhand thrower) and dive into the ground. I will note that the Night Owl putter, while made of a terrible material for a putter, flies as expected for a putter, but displays over-stable characteristics. However, this set does have one saving grace. I found that when thrown at low-speed with a smooth, controlled spin, the "driver" discs actually perform very well, and pull off a gentle, mostly-straight glide throughout the entire flight. In my testing, they worked surprisingly well as putters. The sharp edge helps reduce their chances of bouncing off of chains in spite of the hard, slick plastic they're made of. I will be keeping these discs solely because the company that designed them ACCIDENTALLY made some halfway-decent putting discs. UPDATE: After many throws with these discs, I have improved the score to a three. The reason is that, while they are still cheaply made of low-quality plastic, I have discovered that their severely under-stable characteristics can be compensated for by applying a heavy Hyzer to your throws, which makes the disc's tendency to turn over work in its favor. I was able to get these discs to travel a few hundred feet after I figured this out, and I suspect that with continued practice, they may be able to redeem themselves.