http://www.gamespot.com/articles/xbox-one-sales-reach-at-least-18-million-units-rep/1100-6433643/
Over 18 million XB1 devices that are "active" (running Windows 10 and played in the last 28 days). Obviously there are a few offline users, and some people probably haven't played in the last 28 days. So I think its safe to assume the XB1 has surpassed 18-19 million, and its probably around 20 million. Not as great as PS4 sales of 36 million, but its still surpassed 360 sales, and it has healthy software and hardware sales.
Other source: http://www.winbeta.org/news/at-least-18-million-xbox-one-consoles-have-been-sold-according-to-sources
Made a bet with LipeJJ and HylianYoshi that the XB1 will reach 30 million before Wii U reaches 15 million. Loser has to get avatar picked by winner for 6 months (or if I lose, either 6 months avatar control for both Lipe and Hylian, or my patrick avatar comes back forever).
