How can you tell that it is quality? - Telltale signs of quality.

There's an unmistakable feel and finish to a good tool. You know it when you see it. Here are reasons why:

Efficient design, delivering optimal power-to-weight ratio.
Double counterweighted forged crankshaft for smoothest operation and longest possible life.
Large-shoe centrifugal clutch so the driveshaft engages smoothly and disengages at idle.
Electronic ignition for easier starts and long life.
Premium-grade, co-polymer nylon cutting line.
Splined one piece mainshafts for lightest weight, less wear, and greatest strength.
Smoother operation bushings to reduce vibration.
Anti-vibration mounts