Well, it is not bad for the price. But are you expecting copy cat motor as good as the real one at 1/2 the price? The problem is those thing are not consistance as the good motors are. You might get lucky and get a better than average one, or not. From past experience, most of those products, Chinese, Czech.. are not as well made when they first appeared on the market, most of the products improve in later productions. The price offset to average sport modeler, they are good enough, as long as you are not pushing for 95% eff and 100% power all the time.
Like I mentioned somewhere before, not all brushless motor created equal. The eff ranges from 60%-94%. Just because they say brushless, does not imply quality. Also a nice thing about Astro, the repair facility is here in Ca. AstroBob is pretty good on repairs.
Brian Aero Tow Service.