this be a excellent sander . I really work this machine and it just keep on go . Brace you foot , hang on tight and keep on move ; this be a powerful sander . I usually sand with three grits and when change belt it be rarely necessary to touch the tracking adjustment . the 4 inch footprint be more resistant to tip than my 3 inch sander and ergonomics be perfect for I . con : there be 2 flat spot on the metal front roller 180 degree apart which cause a barely discernible bump but it be not really a problem . it just sometimes make it hard to tell if a belt be about to separate or not . recommend .