Definitely test the machines. The 7 series is a powerhouse, but you should feel comfortable with it, especially if it operates differently from what you are used to.
I’m a committed Bernina user, with 4 machines, and the 7 series is great, but it’s really about you and if you feel comfortable changing to a big computerized machine.
kareno,
Bernina Q20, 830, 440, and L460