I started to pay attention to the single length concept recently, discovered there are definitely more to this than just the PinHawk. There are a bunch of guys offering golf clubs with single length concept and some club makers took all 6 iron heads and bend them to different loft to make a set of 4-PW, this guy is doing all 38" length.
Some are making the 2 length set like DC300 is trying, All irons are 35.5" and 3 & 5 woods are 40"...... Some are all hybrid heads with single length shaft......In short, a lot of going on.