There's also Intentional software (http://intentionalsoftware.com/ http://intentionalsoftware.com/) who offer a similar product. It was hyped quite heavily a

There's also Intentional software (http://intentionalsoftware.com/ http://intentionalsoftware.com/) who offer a similar product. It was hyped quite heavily a few years ago, but I've not heard much about Intentional Software's product or MPS. Is anyone seriously using a language workbench tool? If so, what are you experiences with it?