I have the MVVS 35 ( same as the Evolution ). Fantastic engine. Starts easily. Runs very smoothly with bags of power.
Am getting 7000 rpm on a Menz 20 x 8 wood prop, using a Bisson pitts style silencer. A great engine , highly recommended.
From my personal point of view I wouldn't bother with an SPE ( just another Chinese copy of something else ) My pet hate is cheap, here today gone tomorrow, engines. The Zenoah 38 is a good engine, but the MVVS turns the same prop 400 rpm quicker and it's lighter.
Stands back and waits for flak