I have just bought this product after using some of the cheaper ($6) leather conditioners for a while.  This one certainly seems to be the best at rejuvenating leather.  You can feel the waxy film on your fingers after applying it, which you don't notice with other conditioners, and shows it has somethign substantial in it.All my vehicles have had leather seats and after a few years they have all had dry, cracked creases.  I have just got a "new" used minivan with leather seats and I want to ensure they don't go the same way.  I have to admit I've neglected seats compared with the rest of the vehicle.I used this product on my 1998 pickup's tan-colored front seats which are creased and starting to crack in places.  They were pretty dirty and the only way I found to get the grime out was using a Magic Eraser and leather cleaning solution.  This is a pretty harsh technique, but effective, apart from in the deepest creases.  It did seem to take the shine off the leather, which was a worry.  Using the Lexol conditioner, letting it soak in for 15 mins and then buffing with a microfiber cloth, the sheen is back and the leather feels much more supple.  It will never return to its "new" state, but it should last a few more years with regular applications (not sure but maybe every 3-4 months?).  It takes some effort to get through the stickiness at the first buffing, but the surface quickly eases up and a nice sheen (not a false shine) appears.On my minivan, the leather came up like it was just new.  It smells good too!I bought this product at my local Advance Auto (sorry Amazon!) and would certainly suggest you pay the extra $3-4 over the other conditioners as it really seems to be properly designed to replace the oils in the leather, not just put a protectant shine on the surface.  I'm always sceptical about product claims (since they usually exaggerate performance), but this one seems to be the real deal.Try it.UPDATE (Dec 3 2009):The stiff leather has certainly become more supple after applying this product - it works really well!