At Westjet we now have about 12 airports in Canada with approved RNP approaches. For safety, eliminating N/P approaches and circling and for ecomomy in terms of straight in vs ILS circling and cutting off mileage (up to 26nm in CYXX) they can't be beat.
They do not integrate well in very busy terminal areas which is why we don't have them for CYYZ, CYUL and neither Alaska or WestJet have them for KLAX or CYVR where they would be used to back up ILS outages.