I have to say, I agree wholeheartedly with all 15 of those reasons. We've been using Grails and Groovy extensively (almost exclusively) at Fogbeam Labs for about 3 years now, and I am very happy with how that decision has worked out. I won't say I couldn't be happier, because, as they say, "you don't know what you don't know". But Grails has easily lived up to, and/or exceeded, all of my expectations.