I know several other engine manufacturers did embrace this design early on, many of the old farm engines had the headless design with the walking beam valve train, the big notables were Fairbanks Morse, Witte, and several Waterloo gas engine company spin offs. (pre John Deere Era)
In early Fairbanks Literature it says it was a simple design with less parts to maintain, but the downfall was that this method was noisy and the Fairbanks dealer memos say it was prone to constant adjustment. I really do not know about this, but shortly after this memo all Fairbanks Morse Farm engines with this design were abandoned.
Again in the industrial realm of this design, pre 1910 there were several Gas Engine Producers that used this design like Snow, Buffalo,and several other side shaft engine builders, one notable was the Munzel. Munzel was an engine that was built by Minneapolis Steel and Machinery under license of the G Luther Company of Braunschweig Germany. Munzel visited MSM several times and these visits were Printed in the Minneapolis Journal newspaper one printing noted in April 29, 1905 this revolutionary design was to be built exclusively by MSM.
I have never seen a Munzel engine nor have I ever heard of one existing, this engine was the designed replacement to the Twin City Corliss Patent Steam Engine.
I have several books from the turn of the 20th century about this engine style used. It is fascinating to see where engine design has taken us in just over 100 years.