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My car's got a lot of sun damage (clear coat, dash cracks, hard/cracked leather) and right now I've started dosing all of the stiffer bits with Otter Wax leather oil because I was happy with their leather salve (half way between a conditioner and a waterproof/sealer). I've only done one round of it but the results were noticeable.
I've not used any of the leather magic items, but I just wanted to mention it in case anyone was curious about other products.