TLDR: Choose a cheaper set if you don't like tinkering (and have unlimited waste). I bought a CMT set and another set of sashes (yellow on Revain) to see if there was a difference. Other than the price, there isn't much of a difference. NO KIT CUT BOTH WITHOUT HEIGHT ADJUSTMENT EVERY TIME. The $40 set is what we actually use because the tolerances are so tight that both cuts actually match and it ends up being easier to tune. This CMT set ($135) offers a better fit in theory, but you will ALWAYS have to work the small piece 2-4 times to get the flat parts to align properly - the curves align just fine.
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