It feels top heavy when it's empty! Sadly I haven't had a chance to try using it full of paint. I have no idea why H&S lists things the way they do. All of the needle/nozzle sizes are interchangeable between the Evo, Infinity, and Grafo lines. I'm fairly certain that they also work on an Ultra. The only oddball is the Colani (not counting the Hansa line of brushes). There is a "fine line" aircap and a "standard" aircap, which is interchangeable as well. In my picture above is the standard style cap.