The evaluation from Pull & Mark says it all. I currently use Ranger Edge lenses but being just short of 50, my eyes are changing every year and replacing 3 sets each season will continue to be costly. I just ordered a set of Pillas for this reason. With the Rx insert, I need to replace 1 prescription every year rather than the minimum of 3. Since there is a solid warranty on the lenses, I figured they would pay for themselves in about 4 years. This will also allow me to acquire more panels without assuming the added yearly cost of replacing another color.
Bottom line, if you are looking for glasses without a prescription, Rangers and Decots will go a long way. If you are like many of us on this forum, you'll inevitably amass a collection of colors. If you need correction, bear in mind the replacement costs of the collection that you may be doomed to carry.