I can try to answer it, take in mind I dont know half as much as Nil8r does but Ill give it a shot, its rather simple. Those three companies are on the lower end of the scale, and thier quality control isnt as good as some of the other brands, so malfunctions are more likely, also thier performance isnt as good compared to other companies that cost a bit more, but have greater quality control and performance and will end up lasting you longer.