I used to use straight mink oil on my boots for "waterproofing."  This product/formula intrigued me so I decided to give it a shot.  Lots of complaints about how the can came in the mail, but mine was fine.  The product itself works ok at waterproofing.  The best part to me is that even after getting several coats on my boots, they don't look greasy like a pair that had pure mink oil applied.  It does darken the leather but it has more of a dry look.  Really easy to apply with an old rag and a few minutes.