Based on the FDA, they are aware of reported complications, all of which were a known possibility based on the initial studies and the post marketing approval follow up. So this isn't a case about data being fudged. Post market data is not solely gathered by the company, so can't claim bias in those.
FDA Response to Essure Complaints | NBC4 Washington
It sounds like if there is this much complaints, they should re-evaluate the procedure. I would imagine there would be discomfort of having an inflammatory response in your body and forming scar tissue, at least in the beginning when that happens. Once the scar tissue forms, your body no longer recognizes the foreign object because the scar tissue is blocking it. so its not permanent immune response going on.