Over the past twenty five or so years, I've carried SE, CE and PE, but carry plain edge pretty much exclusively these days. I prefer the look of plain edge and have found it works well for my uses, overall. Still have a CE strapped to my PFD for paddling and another in my bunker gear at work. I, like members have stated, have found SE or CE works well for ripping material open, but isn't great for controlled cutting. It's been my experience SE works best for quick and dirty cuts. I've found some more aggressive serrations are sometimes almost "too" aggressive to initiate some cuts if the material has some give(certain rope that isn't under tension, for example). The serrations catch rather than cut, if that makes sense? That's when I've found the plain edge portion on CE works well, as it more easily starts the cut, followed by the serrations having a bit of momentum to finish up.
The only time I've ever had a knife truly fail for me in a high stress situation, the blade happened to be serrated. There were a number of factors involved, but another crew member's plain edge completed the job.
I'd like to see Sal and Co. consider trying some serrations like are used on Boye knives.