I have a partially used 14 oz. bottle of it sitting in the garage. I haven't used it often for leather... not because its bad, but its not good either.
Its a typical
Meguiar's product that does the job done as advertised, but has nothing special about it. And the thick consistancy makes it hard to remove on deeply grained leather or stitching.
It leaves a slightly sticky feeling but didn't improve the look or condition of the leather at all. However its supposed to provide UV protection.
I have used it on black exterior trim and plastic in the engine compartment with good results, though.
~bw