Lexol is the industry standard and the best stuff I've ever used as far as leather conditioner. I worked for a shop that did many custom leather instals and we tried everything and that worked the best. It leaves a very fine layer of protectant on the leather but it's very effective, most other cleaners leave a thick layer that just looks wrong, that's what's so good about lexol cleaner and protector. The other product I'd recommend is Armor All, it's a very common product but performs very well. Hope that helps.
Clean cars are happy cars!