I bought this product because of the PRS brand aura (which, generally speaking, I find well justified). But my expectations about this conditioner have not been met.
The 3 stars that I gave to the cleaning efficiency and protection are purely theoretical. There is really no way to judge with any perfection as to how well it cleans the fretboard and protects it, the more so that fretboards on my guitars are all in a decent condition. So I'm just assuming that the conditioner does what it is supposed to do.
What does seem to be a problem is the unpleasant smell the conditioner has. I even wrote to the PRS, asking what was the composition of the thing (a quick, polite but effectively meaningless reply followed). Let me put it this way: the conditioner has a strong chemical smell that reminds me of a WC cleaner.
I didn't give it a "Very Poor" rating simply because I still believe in its functionality and out of respect towards PRS. Otherwise, should it have been supplied under a different brand, I would have definitely given it the lower rating possible.
After this unlucky experiment, I just got back to the trusty Dunlop guitar cosmetics with that nice lemon scent. Period.