I don't think reeducation camps should be considered "concentration camps," which brings to mind the mass killings of the Holocaust, but regardless the reeducation program is pretty much complete.
As far as can be considered a successful country, the PRC absolutely fits that. Conditions for the people are rapidly improving, the economy when adjusted for purchasing power parity is the largest in the world, it's a world leader in renewable energy, and is overtaking the rest of the world in key metrics.