We love grails. This page and most of the web applications we create and maintain are written with Grails Web Framework.
We have a team of grails developers, some of them are focused on that framework since 2010.
Since 2010 we gather experience on different versions of grails. We highly suggest and help in upgrading grails to newer releases, but for some of our clients we still support systems created in grails 2.x and even grails 1.3.9.