I will preface this with, I am very used to and comfortable with the Sona. This is a change and I wasn’t expecting it to be a significant change. It’s definitely got a learning curve. Seems to me like the nozzle (?) is smaller but deeper. The sensation is like the Sona, but I notice that the + and - don’t seem as responsive to up and down as the Sona. The cruise control is the real thing I’m having issues getting used to. Overall, I think I’ll get used to it, but it’s still not up there with the Sona for me yet.