Car and Driver Magazine covers Mazda's SKYACTIV-G and SKYACTIV-D engines in detail in the article linked below, included, Mazda's 2.0L SKYACTIV-G engine available in 2016 CX-3 & 2014-Current Mazda3. Making it even better, 53 high-quality photo's and a lengthy discussion
I'm certainly not an expert, but the engine and transmission seem to be quite well-engineered. Kudos to them for getting the most out of a "standard" setup rather than going the turbo/CVT route. This powertrain should prove very durable.