You’ll need to ask Mano, or Boydo maybe. I was on the Irvine with Mano, and he highly recommended it. Apparently there’s a 5min shuttle, and a 45min run, so you can do it all day long… Water is apparently big standing waves (class 3?), but often lots of strainers. I gather it’s only worthwhile at the absolute highest flows of the year.
My main interest in running it comes from having grown up in the area, and fishing there as a kid. Not because I expect it to be an amazing run.