I believe the 2 hour deal is a great idea.
As someone said earlier, nothing happens until the last 30 minutes anyway. Depending upon who's sale it is, sometimes I don't even log in until 2 hours after the end time.
I personally like the Horse Race style of bidding. Most of the time, we pick a seller more so than pick a calf. I will go out and look at the cattle in person, and if there are 5 or 6 that we would live with then that is the sale we try to buy out of. The Horse Race bidding allows us to get outbid on our #1 choice, and move to our #2...and so on.
I am the most comfortable with just calling in my bids. I will call the seller, tell them who I am, and tell them to bid for me. This way, nobody has any idea what I want to spend. I just don't know if I trust the Max Bid or Proxy Bid system. SOMEONE knows how much that Max Bid is, and nobody can tell me otherwise.