Is the company Viagogo a legitimate business?

It looks like an eBay for event tickets. I don't see anything wrong after a quick look, but have never used it. Maybe others will chime in.

Customer reviews of Viagogo W6 0NB, Ticket Agencies Operation in London on BView

Seems like about 1/2 of the reviews I found ( several review sites) it was about mixed, many complaints about not getting tickets, but that is because of the seller not the site.

With any online purchase you are always taking a risk.