All of our GPSs show lots of non-existent roads in Texas. Apparently Texas is very generous in allowing people to close existing roads and none of the GPS programs seem to know about it. Numerous friends of mine have to tell people not to use GPS and then explain to people how to get to their house or, if they are lucky, tell visitors that the GPS DOES work to their house... Older GPSs are not correct for our house either, but it got people close enough for them to be able to home in on us.
I like the built-in GPS a lot -- after not using 3 previous cars' GPS but using a good standalone GPS (NOT a phone!). I like that it displays the speed limit and the display is nice and bright and easy to read. I like the ease of getting to display to display and the split screen mode.
But there are issues with it. Being built-in, we cannot enter a location while the car is moving. Why don't they detect weight on the passenger seat (which they do anyway) and let the GPS be changed!?!? I guess that is the worst feature of a built-in GPS, true also of our previous car.
I like that it gives you two next turns if close together. Our separate GPS is a motorhome GPS for which you really really need that kind of information. So we are happy to see it on a normal GPS. I like that you can easily turn the sound on and off.
I seriously dislike the fact that it displays "street" names and not numbers. In the countryside, these street names are not displayed at all or difficult to find whereas route NUMBERS are always announced. Our separate GPS has both most of the time, I think -- but in any case did not cause us trouble.
The other issue is how to enter a location or waypoint that is not an address. Our last car had "city center" which was not what we wanted but at least got us going that way and not the way it wanted to go. It also seems particuarly grouchy about how you enter "street" addresses. Texas Farm to Market 2346 is written how? Even an interstate?
We frequently want to make the GPSs decide on a different route because they just love interstates and toll roads and certain roads and we prefer country roads. Even turning off interstates and toll roads does not generally go the way we want, hence the need for waypoints. But we only know we want to go toward a certain town, and don't know an address in the town. Fastest and shortest neither one seems optimum for us.