I bought a Bernina Quilt Frame about 18 months ago. I have a Bernina 440 (which is about the same size as your machine) So far I've quilted 3 bed size quilts and a baby quilt on it. I really enjoy doing quilts on my frame.
I would love to have more quilting room because I only have about 4 1/2" to quilt - but some day maybe I'll get a long arm!!! As you said, you get into the zone.