i am also having this 3m performance finish, personally i agree with you its protection better than megs nxt, provide real good/strong protecting layer to car skin , i have tried it on dark and lights colours but i found better results ( optical ) on light colours like white, silver, sky blue type colours , people dont have sealants sure they can use it as substitute , after surface preparation give 2 coats of this with interval of 8 hours than top up with any natural wax for best protection and looks ( i use this performance finish with 3m perfect it paste wax )
apply real thin otherwise its hard to buff out, do panel by panel 