I received the CitriStar juicer, and immediately after opening it, found that, about 25% of the time, the motor would buzz instead of engaging and rotating.
When I called Tribest, they told me firmly that I needed to press down on it using a citrus fruit instead of my hand, and then it would work properly. This turned out to not be true (not surprising, as the juicer does not appear to include sensors and circuitry to insure that the object pressing on it is a citrus juicer instead of, say, a couple of fingers). I called them back, and they said that I could only return it, under warranty, after registering the product. I did this, and called them back yet again. I was then told that they would examine it for possible warranty repair or replacement. When I told them that it was defective right out of the box, and that I did not want a repaired defective item, but a new item, they informed me that they simply don't do exchanges under any circumstances, and that they could not help me. I am currently taking care of this via my credit card company.
The thing is, I really liked the product based on its description, more powerful motor, and so on. If only it worked as advertised, or was cheerfully replaced with one that worked as advertised. Oh well.