Got 2 Garmins. One old and one newer. Both function well if you keep the maps and software up to date.
I do agree that I don't want to rely on a smartphone with a data requirement, so the Garmin standalone models work for me. They both have lifetime maps/software/traffic updates, and 4Square or uploaded POI files for POI info.
Mike. Comments are anecdotal or personal opinions, and worth what you paid for them.
2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 Wrangler JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)