l have a 46 - is one of the best engines l've had - starts very well, lots of power, quiet, was VERY affordable.
After a year can still start it virtually every time without starter motor - prime it, put on glow, couple of flips with stick and away it goes.

As advertised - rec'd the engine, mounted it onto the plane, went to the flying field, started it up and took off!!!!!!! and havent looked back since.
Several club members have had the same experiences.
Out of the BOX and into the SKY!!!!

any new engines in the future will be Evolution for sure.