Sally Nutt, a member of the Xing (social software platform for professionals) staff recommends HotGloo in Xing’s “User Experience” forum. Since there is no official Beta Version out yet, the testing must have happened during the HotGloo Alpha Phase. The topic of the Xing threat is about the best wireframe and mockup tools and gives an overview about the different programs that are out there, clustered by price & low vs. high fidelity. If you’re interested in the discussion you’ll find the forum, in German language, here.
Thank you very much for the recommendation!