Roku has sold 10 million streaming players in the US

"Today we’re happy to announce that we have sold 10 million Roku players in the United States! This is a huge milestone for our company and we want to thank all of you for helping us to achieve it. We are dedicated to bringing consumers the best streaming TV experience and we’re grateful that our fans continue to support and recognize us for making America’s favorite streaming players.
Just over six years ago we shipped the very first Roku player to stream Netflix to the TV and now our players are synonymous with TV streaming. Today Roku players feature more than 1,800 channels – that’s 1,000 more channels than available on other streaming players. And because of this vast selection of entertainment, Roku players stream more than other streaming players. In fact, new NPD data1 found that Roku is the popular choice among streaming players and accounts for an aggregate 37 million hours of video streamed per week compared to Apple TV at 15 million hours, Chromecast at 12 million hours and Amazon Fire TV at six million hours. You’re also referring your friends to Roku more than any other streaming device, according to NPD. Thank you!"

Source:  Roku blog, 16th September 2014