I have been using Sonus leather Conditioner for about 4 months now. I really like this stuff. It makes the leather really soft and brings back that new car/leather scent. I decided to order Z10 to see what all the fuzz is about and I tried it today. It has a very strong scent, but I did not find it very pleasant, and IMO, it does not come anywhere close to the new leather scent; instead, it smells a lot like the auto air freshener spray by Auto Expression ("new car" scent), which is not very pleasant. In addition, Z10 left the leather looking and feeling a bit more dry than when I use Sonus, which IMO, adds more moisture. I will be wiping my seats tomorrow and reapplying Sonus. On Sunday I will be trying Z8 on top of Ultima PGP. I will post the pics, I am expecting some amazing results, as my car already looks great with the Ultima PGP.