It's faster than rails, and IMO nicer to develop with. Having all the Java libraries without having to code in Java is sweet. The ORM is really well-designed and the built-in object cache is super fast. The template system has its quirks, but once you get used to it, is also really sweet.

aaroniba de ycombinator.com hablando de Helma. Quizás quedaría mucho más coherente un sistema de templates basado en JSON y que se convierta a XHTML al solicitar la página (JsonML.template sería una opción perfecta).

More praise for Helma. Via Zumbrunn.com