A recent study by Dresner Advisory Services found that Open Source BI solutions have fresh growing customers compared to commercial BI vendors, and most of the customers have been achived by the last two years.
Gartner analyst Rita Sallam said "While Open Source has been the fastest growing category in recent years, it still lags behind the commercials". This is expecially true in mid-sized to big companies where the ease of use, functionality and performance of commercial Business Intelligence solutions is a prefereable choice over Open Source BI solutions.
Open Source Business Intelligence is still a young market, however is growing quickly and many companies are placing opens source BI solutions side by side to commercial BI solutions.
Here is the full article http://www.enterpriseappstoday.com/business-intelligence/open-source-business-intelligence.html