Looking to make a change from my Gratz reformer...I find the kneeling side-arm series is so challenging even on the lightest 1/2 spring for many of my clients. I have the tower/reformer combo. Maybe I am just "the grass is always greener," but I feel like there must be a machine that is more universally comfortable for men and women of all sizes and ages. Appreciate your ideas and feedback. Curious particularly about the Center Line. Thanks!