Most of the bad reviews I can find are complaining about the over-charging from face value (which is to be expected if you're going to see someone like Justin Bieber as you've said), and something about them not printing off replacement tickets if they get lost or stolen, so I'm not sure if that's any worse than other ticket vendors or buying them straight from the venue / distributors. Most of the feedback about this company seems good though Kazanne, and everyone got their tickets sent to them, it was just issues with after receiving them / the price of them, so I wouldn't worry too much