I remember when I first heard of them and considered one of their machines. But husband and I both had doubts and thought they would be challenged by Apple and lose. They sure did have, at the time, very attractively priced machines compared to Apple.
It just never pays in time and money and aggravation to go with some knock-off stuff. It's always grief.
It's much much better to go with Apple and/or their approved sellers and products that supplement Apple and their products. You don't have any of the grief and aggravation that you'll get from those knock-offs and wanna-bes...