Original syma motors are actually considered of good quality...The only considered "high quality" motors built are Chaoli motors but,they are very expensive for brushed motors...When SYMA came out with the X1 a while back it was rumored that they sourced motors through Chaoli...Not 100 percent confirmed but on some independent testing the X1 motors were among the most powerful motors you could get with a quad back then..Even by todays standards they would stand out among other 7mm motors power wise...Well, actually Hubsan and Syma motors
What some dont know is ,a motor chosen to power a "geared" quad are not the same as ones chosen to power a "direct drive" quad....The power and torque curve and at what rpm different quite a bit between them...Syma geared motors arent a good choice for direct drive as hubsan motors arent for geared quads.
Motors designed for geared quads typically have a lower maximum rpm but create higher torque...The gearing compensates for lack of rpm but keeps its torque.