Just stumbled across this and I am suprised about the reviews.
I wanted tickets for a sold out event and found Viagogo, they host a platform to allow people to resell their tickets for more or less than the face value.
I paid a little more than face value and also the fees which where clear when checking out, and received them in plenty of time and really enjoy the event, with great seats as well.
No problems here, and can only recommend.