We drove 200 miles to Crazy Lennys, tested some models. and bought our first ebike. Met the OP's price point too. I'm happy with it. Never had an issue. I guess they're happy too. Had a warranty. Never used it (or needed to use it).

Since then, like William and Nelson, I'm into home kits. We had good bikes in the garage. So add motor. I've done the BBS02 and a few rear geared hub motors.

No, I can't build a bike with a new frame for less money than an Ancheer. And it would be hard to match a $1099 Cross Current AIR, except I guess those are now $1399 on amazon. In that case, I would agree with William. A BBS02/shark battery on a mountain bike won't look as sleek, but will be a better riding experience. None of that Class III no throttle nonsense.

As for an Ancheer, probably many tens of thousands of them in China. For short rides, say an hour at 15 mph, it ought to work fine. It will probably benefit from a good lubrication and tuning of shifters/brakes. Sure, it will be a clunky bike, but it will have a motor.