Caring for Leather Boots?

Hi,

I recently bought a pair of Irish Setter Elk Tracker 860 hunting boots:
http://www.irishsetterboots.com/shoe-zoom.cfm?style=860

I was wondering what is recommended for maintining these boots?
How often should they be treated if you use them everyday for several hours
in snowy, salty, slushy conditions?

The store clerk recommended that I use Danner Boot Dressing:
http://www.danner.com/products.asp?catid=6&prodid=2224

The clerk told me they were already treated and didn't need to be treated.
But I treated the boots with the danner boot dressing before using them
anyway.
I can't see it doing any harm.

Anyway, I use them everyday in cold, snowy, icy, salty, and slushy
conditions. I wanted something comfortable to wear for several hours, that's
waterproof
and warm in the winter with temperatures averaging around -15 celsius or 5
fahrenheit and as low as -40c or-40f.

I clean the boots every day after using them with a damp cloth and then
remove the insoles and place them vertically inside the boot to let any
moisture evaporate.

A Danner representative told me I should be treating them with danner
waterproof gel. The Irish Setter web site recommends that I care for these
boots with Irish
Setter Silicon. I heard people saying they should only treat them with
conditioners, because
the waterproofing compounds can dry out the leather and it cracks. I've read
that some people who use them everyday recommend using Danner Boot Dressing
every two weeks.

Thanks,
Marc