Prompt communication isn’t really their selling point or strong point for that matter. There have definitely been some people that have run the MakerX standard sizes and several others that have tested the stronger ones but imo it is still a pretty untested product.
Someone else might offer other opinions, but the feeling I have gotten overall is that they are decent, but don’t run them over their voltage / amp limits
I don’t know if you read this thread or not but there is feedback in here