Get yourself some NIK-WAX, apply sparingly and not to often. If your boots get wet from a wet run do NOT dry them by a heater or fire etc, let them air dry, this will prolong the life of the leather. I wear gore-tex lined boots at work every day and they get a lot of punnishment and an odd coat of NIK-WAX keeps the leather subtle.
Maker specific products are usualy a rip off.