Motoforce Sport 50cc cylinder - has anyone on here tried one?

I'm mulling over the idea of trying a Motoforce Sport 50cc cast iron cylinder, instead of the standard one I have at the moment. The thing is, I can't find any dyno graphs or tests that directly compare the Motoforce Sport 50cc against the stock one for a Peugeot (or any other similar Minarelli-based scooter). Most of the graphs I found relate to the 70cc version.

Has anyone tried one of these Motoforce Sport 50cc cylinders? Generally, the comments are that the Motoforce cast iron 70cc ones are durable and offer some useful extra power, but how much, at what revs and is that with the standard 10mm crank?

Any ideas, anyone?