I agree with all the sentiment surrounding the Cyclone M2. My only problems with it are the super heavy return spring, which doesn't play well with retrofriction levers, large chain gap because it was designed for freewheels which had bigger smallest cogs, and the inability to do more than 8 speeds without modification. I've successfully modified mine to do 9, but it shifts somewhat badly on the small cogs because of its large chain gap, and generally has a hard time of it all.
I think that is one benefit of the Superbe Pro over the Cyclone M2: better set up for smaller cogs and a wider swing for more cogs. It does come at the expense of a couple tens of grams. I really like friction shifting modern cassettes, though, so it probably makes sense for me. For a freewheel, the Cyclone M2 is perfect - but you're probably gaining all the weight you saved on the derailleur, by using a freewheel.
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Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.