The Knew Concepts' saws are interesting and maybe a slight improvement over traditional fret and coping saws. Being able to turn the blade in the fret saw without using a pair of "dikes" to twist it is a great improvement but in use I find there is little difference between the two. Both use the same blades, both are slow cutting with a short throw. Breaking blades in either isn't a problem with good technique. Of the two, Knew Concepts fret or traditional fret saws, I will pick up the traditional about as often as the Knew Concepts, usually the one first on the turning saw rack is the one that gets the love.
I do not have a Knew Concepts coping saw so I can't address if it is an improvement over a Olsen coping saw but with a few mods to the Olsen I can get all the tension needed and the blade will not turn unless I make it. With a coping saw the blades are too thick to fit in my dovetail saw kerf, it limits the saws use for removing waste from dovetails and as with the fret saw the throw is too short for efficient sawing. Whatever, the cost difference between the saws (Olsen $13 USD, Knew Concepts $149 USD) would make it difficult to justify the Knew Concepts for so little potential gain.
The jewel of my turning saws is the TFWW 12" Bow Saw. Its blade is almost as thin as a fret saw blade, it has a 12" throw vs. a 5" throw with either a coping or fret saw. The bow saw makes very quick work of sawing dovetail waste, much faster than either a fret or coping saw. Because of its narrow blade it is almost as easy to turn as a fret saw and much easier than a coping saw. At $169 USD vs. $95 USD for the Knew Concepts coping saw or $149 USD for the Aluminum fret saw the 12" bow saw is a better saw for little more money and is a bargain compared to the Titanium ones.
As always with anything wood....YMMV.
Much thanks to Ralph over at The Accidental Woodworker for a very nice surprise package in today's delivery. I'm still speechless, once I recover I will post photos. Thanks Ralph, you shouldn't have but I thank you. BTW, the box is beautiful.