That's good to know re: Mr Sheen, I have never really considered it, but will definitely try it in future once I finish my current leather conditioners. It will represent great value too compared to how much many of the other automotive leather cleaners cost.
To date, I have used the Meguiars Gold Class conditioner, which works well as both a conditioner and cleaner, but have recently purchased the Oakwood Leather Protection Pack (
http://www.supercheapauto.com.au/online-store/products/Oakwood-Leather-Cleaner-Conditioner-Twin-Pack-Twin-Pack.aspx?pid=165302#Cross), which I prefer over the Meguiars.
I feel it conditions and cleans the tan leather in my BRG much better than the Meguiars, more notably in terms of softness, which is an indicator of the natural oils in the leather being rejuvenated to prevent cracking and fading.