I bought 2 of the smaller scales at the $12 price. One has quit already but the other is holding up okay and is very accurate.
The picture showing 2 scales is my setup for weighing parts. I turn on both scales, tare them at least once and then weigh the part on both scales. They will usually be within 1mg of each other.
The hanging apparatus seems to work really well for weighing whole models. There's no issue with static and not much of a problem with air movement since the model is hanging vertically.