So far I have found nothing in the small Profi engines I have to suggest they are not worth every dollar I paid for them. The combat .061 is no harder to start than a TD .049 and spun the living crap out of a fg combat prop on the first run and just keeps wailing away with little fuss. The proto speed .049 was also a piece of cake to handle on the first bench runs, although we were under fluorescent light in a shop so no tach readings. But it sure sounded snotty on a 4.2x4 and 10%. Never handled a Cyclon, I guess they might evoke much the same response.
MJD, I want to hear about the Picco .05 engine with a speed or a pylon prop after it has consumed a gallon or more of fuel. So far there is a lot of confusing input saying that these engines won't break if they are treated right..