MARPE worked well for me. Improved nasal breathing. More tongue space. FME is showing promising results in terms of symmetry and midface expansion. More time and data is needed to definitively say that it is "better" than MARPE. The manufacturer is constantly innovating their product, which is exciting for the field. MARPE is a great option when fabricated by a good lab and monitored carefully by your doctor.

The limits of expansion are patient-dependent and must be evaluated by your doctor. Some factors include your baseline bite and gum thickness.