Just moved to Idaho this summer and heard about this auction last week.
Great event, I went the night before and picked out my top 3. Gave them all a thourogh twice over and they let you start them and look under the hoods. I did end up buying a sled and saved over $2k off the local craigslist prices. I'll be going every year to buy, real hit or miss on the selling part. I'd recommend using a reserve if you're planning to sell a newer sled.