Well ....
the mio soft is a long term leaker - they changed the design a while ago in the hope it would get better but hasn't really.
the mio ultra wrap is better but the waistband is really stiff and digs in when they are sitting
the Mio lite is the better of all three wraps - softer, wider waistband and poppers - better for wider bums but not great over prefolds as quite wide.