Challenge and others sell no resonator midpipes, for twice as much or more.
Plenty of people have used Top Speed replica midpipes and exhausts with no problems.
If I was a competitor selling cheap chinese parts like some of the other "name brand" exhaust sellers, I would be worried and doing whatever I could to put down the Top Speed part.
Some of the competitors do make very nice parts. I like the Borla quad resonator midpipe. I would have no qualms about Borla's quality control. But if a no-name part comes out with dual resonators for half the price, I would be tempted. I have had two no-name exhausts before, a set of headers and a rear exhaust, and neither gave me any issues.