CoPllot stores the map information on your iPhone so be sure you have sufficient room to hold it. Updates do take awhile. I had to take it off my 6 Plus because I failed to get a memory upgrade.
CoPilot was good for us and I agree with the comments above. It had it's good and bad points. Being more accustomed with app mapping, I was annoyed with the non-standard way destinations were entered and often with the inability to find an exact address.
X2 on checking your route with other apps - DW also uses paper maps - checking makes the trip more enjoyable in my opinion as opposed to just pounding out the miles.