:Carl W. Olofson, of IDC, April 2005, ICD #33180, Volume 1 http://www.idc.com/getdoc.jsp?containerId=33180 and http://www.intersystems.com/cache/analysts/BestKeptSecret.pdf said "Given the scope of its capabilities and the users of Cache, the product and its maker qualify as the best-kept secret of the software industry".  So, that's who, in particular, has actually said this.  But it has been said many times before this.