I have only good thinsg to say about Joobi. I have installed Acajoom/jNews on several servers for different clients of mine. And everything works just perfect. One of my clients have just sent out over 10.000 letters to their customers with no problems what so ever. I had on two installations some problems and the Joobi support helped me right away - no hassel and biting of fingernails!
I will recommend Joobi on the highest level and their customers service is just great!