Yes, we eat our own dog food!
Along with using Liquid XML for our consultancy work, we also use Liquid XML to write Liquid XML!!
Liquid XML Data Binder was used to generate C# Data Binding libraries for our new Project files (lxsproj) and we have long used the Liquid XML Data Binder to generate code for the Liquid XML Data Binding Wizard project (xdbproj) files.
Our support and testing teams also make extensive use of Liquid XML Studio 2009 for validating XML Schema and XML documents.