Here is a quick list of the highlights:
- Clear & balanced sound
- Sufficient punch or edge created by the reed
- Fairly easy to keep a clear sound even after embouchure fatigue
This combination creates a reed that is malleable and easily shaped by the player, as opposed to reed that shaped the player's sound for him or her. The RJS filed reeds are much like a mouthpiece with a medium baffle that sometimes offers a wider sound palette than one with a high baffle.
As far as consistency goes, if you expect the same you get from most brands of reeds you'll be happy. Here are a couple clips from a recent playtest.