I thought it was a fun enough episode, although definitely not one of their more interesting or enlightening ones. Most of the survival tricks we've already seen countless times on Man vs Wild or Survivorman, and most of the duct tape creations seemed more showoffy than truly life-saving.
As for Unchained Reaction, I only saw the first episode so far, but wasn't terribly impressed. The final contraptions are kinda fun to watch, but it turns out that actually watching them get built...? Not so much.