I have the factory tow mirrors on my F150, they are awesome - both towing and not towing! Properly adjusted you have no blind spots. Very easy to back the camper in with a much larger field of vision. Yes they are pricy, but I look at the price of safety and hassle of an accident and the cost was worth it. No regrets.
2013 Jayco JayFlight 26RKS
2013 Ford F150 Ecoboost FX4
2003 Coleman Bayside / 2011 Jayco Jayfeather X20E -- RIP
2012 Tacoma Sport DCSB / 2013 Tundra SR5 - RIP