I`ve been using Fast Fret for a really long time and thought let?s try something else.
Pros: nice smell, a bottle lasts for a long time
Cons: I don`t hear and feel any difference after using it.
I like how the fast fret restores some brightness, high end and life in strings and also makes them smoother and faster to play. This one doesn`t do it. Also you have to pour it onto a somekind of fabric which is annoying.
Anyway I still believe in it`s ability to clean strings, so after a long gig when strings need a bit more maintenance i first use the dAndrea and then Fast Fret, for that extra "polish".