Finally, you throw a third disc, and it fades off to the right. That disc is understable . Most folks might consider the Eagle to be overstable, but touring pro Todd Branch of the Winnicrew has enough power and snap to consider the Eagle to be understable in many situations. Fortunately for the rest of us, the general stability ratings given to discs are geared toward the average disc golfer. Disc wear can also have a great impact on the stability of a disc.
All discs become more understable with use and abuse, some faster than others.
If a disc 'wears well,' that means it can take considerable abuse and still retain much of its original stability. The best wearing discs tend to be premium lines such as Innova's Ken Climo Signature Series and Discraft's Elite Pro Line. You pay a little more, but they last longer. Most disc golfers carry a mix of stability in their bags, since not every throw needs to go straight. When shopping for drivers, new players should look for discs that are described as stable or understable.