We do not have any commercial competitors.  Of those who could ju8mp into the space, the most threatening is Nuance and Google (both of which have a lot of data and good recognition for large vocabulary open dictation or search).  Nuance's customer service record suggests they will not provide customized grammars.  In a few years Google will probably enable Chrome users to provide custom grammars but it is not clear IE has this on their road-map.