I'm going to play devil's advocate (bear in mind I have two xpoles and prefer to pay for quality). I would gather that most poles come down either due to improper installation or poor design, like a tensioning rod that tightens one way and can easily come loose through use.
The knock-off pole I bought was an xpole copycat (in fact I thought it was an xpole, that's why I bought it), so it's design was essentially the same. Assuming it was properly installed (like any of the major brands), it would have to be the material that failed. Bad welds, brittle/inferior metals...which can certainly be a problem. You have no way of knowing either. We excluded some pipe manufacturers from bidding on our projects because they moved their foundries to China and the quality control isn't the same as the US foundries.
Personally, I hate the x-joint. Hate it. It can slip, get stuck, cause the pole to flare, the little nubby sometimes gets smashed down... IMO, If an x-joint isn't inspected on a regular basis, it's a real safety hazard.
The knock-off pole I briefly owned seemed safe enough, but I guarantee the finish would have flaked off after a little hard use. I do wish I had it so I could have three poles for occasional pole jams, but I would not want it as my primary pole. The $150 or so I'd save isn't worth the lack of quality control. And AndI probably would have had to replace it after a year anyway.
The finish on my friend's crappy pole is, well, crappy. It seems plastic when you touch it.