The Ergo design has been around for awhile. They were designed for cooks with repetitive stress injuries to their hands and wrists. Like most "ergonomic" handled knives, they suit a small group of people -- but no means everyone, even in their target group.
Note that Fieri wears a forearm brace/bandage when cooking. I believe that's how he discovered Ergo.
Speaking of target groups, the thought was that it could be expanded to the general population and that the handle design would overcome the typical grip deficiencies. But that was an afterthought and seems to be an idea which hasn't caught on.
The blades themselves are rather thick and awkward, made from an alloy which does not have good edge characteristics.
It isn't really fair to Ergo or Shun to compare them to one another. They were designed for different purposes, and are marketed differently. Other than looking funny, they don't really have much in common.