Nothing very detailed to report, I'm afraid - I used to fly an Apollo Fox, more or less in the same category as the C42, but I never flew any SEP.
On a very general note, however, I should warn against considering the C42 a low-cost alternative to a C172, the step is bigger than that. It is not "changing from a big family car to a modest family car", as you seem to consider it; the better comparison is "changing from a modest family car to a middle class moped". It might be more challenging than you'd expect - depending on expectations, it might also be more fun.