Back in 2000, I bought a new 2001 BMW 3 Series, Jet Black, 5speed, etc...
Black Leather, Sport Seats, etc...
On the few websites/blogs back then, the buzzword was Lexol.
I went to the store, picked up a bottle, unscrewed the cap and was almost sickened by the smell. It was like medicine or something. It didnt smell to me, like it belonged on Leather, so I didnt use it.
Move forward to the next year - people on the same websites/blogs are now saying that their religious applications of Lexol has made all their Leather surfaces in the Bimmers very Sticky and not anything like they were when they bought their Bimmers new a year ago...
Along the way, I researched and found this product - Spinneybeck.com, called and talked to the Regional Rep who told me that they supply more hides than anyone else to automotive industry across the world. I asked them what do they put on their hides after Tanning, etc., when the hides are ready to be shipped out to be made into car seats, etc...
He said they sell the same product they use as a Leather Conditioner, so I bought it and have been happy with its performance for over 10 years.
Its white in color and has a different smell that goes away after application and the leather smells like clean leather (if cleaned appropriately and completely), and the leather is smooth, more supple, not sticky, or shiny, but more of a matte finish, which is what I like, and what the majority of my Clients like.
Just recently I bought a few different formulations of the Leather Master product line and their conditioners smell very, very, much like the Spinneybeck product I bought over 10 years ago..
So I have Spinneybeck, Leather Masters, Zaino, and Einszett Leather Conditioner, and any of these seem to do good things on Leather for me and some smell more like "leather" than others... I pick out what will work best after evaluating the Interior, the scope of work, the feedback from what the Client wants, and what I feel will work best for that job...
Dan F