BJW - are you for real, or are you just an average rider who doesnt know the difference...
If you ride hard - the whole game changes and is instantly noticeable - do you think when designing kites, they take awhile to get "used to it".
A couple of runs out n back - and thats it ! It gets binned instantly if it doesnt work
Theres enough shop bull sales yarns to fill another Ocean - unfortunately noobs and average riders get rolled from believing it.
A great example is when a kite company enthusiastically says "its a radically redesigned kite" -
translates to "oh we messed up there". Better try another design.
So
demo demo demo 
unless you have more money than skill...