Severe over-pronation and metatarsal stress fracture

I have been wearing custom orthotics due to severe over-pronation and metatarsal stress fracture. PT changed me from mc shoes to stability shoes and added strengthening exercises. I have heard that custom orthotics are great. I am thinking of getting orthotics treatment from Toronto(Physiomed). Anyone have experiences with custom orthotics? Are they effective for the problems that I have?