I’ve used S&T since it first came out for RV trips and my Lion’s Citrus & Rose delivery route planning. There are no maps, GPS or software that is 100% correct but S&T is so much easier to make route corrections than a GPS is and it’s loaded with POI, campground info, etc. Then just this year I learned how to easily transfer S&T routes to my Garmin GPS exactly as planed with S&T.
I usually upgrade S&T about every 2 years so that recently created addresses and map corrections are included. The only reason I use the Garmin GPS while traveling is that my copilot does not like computers, GPS or any such electronic equipment and there is no visibly good place to set my laptop in the MH for me to use it.
Dave