I went to Costco yesterday to take a look at the Silverton 620. They said that the 620 in store inventory was completely sold out and only available online at $799 delivered instead of the $699 in store pricing. If they had inventory in store at $699, I probably would have purchased one yesterday. At $799 it is the same price as the Pro 575. The sawhorse legs on the Pro 575 seem more stable than the cabinet base of the Silverton. With the Silverton design, I was a little disappointed with the short depth of the front table and the heat shield seemed very flimsy as an arched piece of metal vs the traditional bent steel 2 sided box. I did like the how the lid opened up to give access to the grill.
Still undecided between Treager Pro 575, Silverton 620, Camp Chef Deluxe at Sportsmans Warehouse (@$600) , or Camp Chef Winwood 24. All are at $800 except as noted, and I am awaiting for a sale to push me one way or another.