Today I'm linking to Golf Digest's test of the new single-length Cobra clubs designed with Bryson DeChambeau. There are two sets, the King F7 and King Forged Tour, and the testers compared the new models with the original models.
The article mentions a set designed by Bobby Jones in the 1930s that used pairs of matched-length clubs; I was aware of the design but not that they had actually been produced for sale in the 1980s. At the other end of the spectrum, the article explains small things such as how the single-length design affects dispersal patterns and distance gaps between clubs. It's these sorts of little details that make this a very thorough article, a sort of a history of this idea as well as a listing of both the advantages and disadvantages the testers found.
I found this article to be very interesting, a nice explanation of the pros and cons without dropping into heavy technical lingo. I don't know that this idea will catch on but, as the authors of the article said, it may stimulate the design of future clubs that are easier to hit. Give the article a read; you won't be wasting your time.