The Midwesr Aerostar is a great trainer plane. My second plane was an Aerostar with a Saito GK .50 and it flew very well.
It lasted all through my flight learning curve and didn't meet it's demise until I was learning aerobatics. [Inverted flight 1-1/2 feet off the tops of the beans, down is up and up is........]

First plane was a PT-40 with a 2-cycle Royal .45 Climbed like a rocket, way over powered for a beginner!

The Aerostar with a .50-.52 4-stroke is definately a winner! Learning the 4-stroke as a beginner wasn't that big of a deal. just set it and forget it! Very reliable for a beginner to use!