Buying properties on auction.com in Denver?

[Timothy Howdeshell]

Hi BP,

Has anyone, or is anyone currently using Auction.com to purchase foreclosed properties in the Denver market? It seems that there are quite a few properties which can be purchased under market value. Of course, it is imperative to do your own numbers. I see these properties listed on Zillow when I'm casually browsing, and am curious who purchases them and how. 

Additionally, how is the process done? Do you need "all cash"?

Thank you for your input!