Well, for what it's worth, I've taken a few of the above mentioned on overnighters as a substitute for the camp axe and this is what I've found.
TOPS- it's a boat anchor. The grind does NOT lend to chopping and the ergonomics of the handle are awesome for producing blisters. The saw is totally ineffective.
Red Scorpion Six- In this instance the edge is ground too thin to maintain. Its light enough to wield around but a couple of whacks into hard wood (not batoning) and the edge is through. Overall this is the cheapest in production and price of any WSK you'll find. Saw teeth are effective and aggresive.
Shanz Messer- Great blade, more of a collector's piece but I went after a piece of maple with it and it didn't loose edge. The handle, while contoured more than the TOPS still felt a bit thick in the hand. Saw, effective too a point- jammed after about an inch depth.
Tim Horan- I contacted Tim to make a small version of his WSK that I could carry while flying. This by far is my favorite. While my miniature was not the biggest WSK, its proportional in size and balance. Edges maintained against 3/8" thick Lexan plexiglass (helicopter windhield) loong story- and the contour of the handle was the only one that felt so natural it was like an extension of the hand. Saw (on my model) was small due to o/a size but effective.
Last but not least Roger (the Crook) Linger- I picked up this WSK and companion combo from another BF member so can't say I had any dealings with said crook but from what I read he ain't on many Christmas card lists. That said, the crook makes a hell of a blade. The WSK is well balanced with a good heft (well over a pound) edges are good and it is the most effective chopper I found. Contour of the handle was smoothed and grippy- no blisters after taking down a 4 inch (dead) maple. The companion is a great little knife too suited for any camp chore but thats a different story.
Overall, out of the above IMHO I would recommend Horan's WSK. You're going to wait, and your'e going to shell out some coin- 3 of the 5 above were over 5 bills but after using the other 2, it's obvious you get what you pay for. Either that or go hammer it out of spring steel yourself a la Benicio Del Toro in the Hunted (it only took him 5 minutes

)
ANYhow, the thoughts on this knife and it's design are either "I love it and can take down a forrest with it" or "This is a gimmick, snake oil, mall ninja yadayada"
Hope this helps!!
happy choppin