We'd talked for a few years about getting a GPS. It wouldn't have done us much good in Trinidad, though, due to the lack of satellite maps for the island. (At least while we were there. Perhaps that's different now.)
We finally got one, a Garmin, last summer after we returned to D.C. from home leave. There was a lot of research, at least on Kevin's part, and the choice of a specific model was made based on the inclusion of European maps.
So when we arrived in Milan at the end of June and Kevin went to Rome a week later to pick up the car we'd bought, the GPS got is first European workout. And thus we discovered a problem. The pesky thing couldn't figure out where it was for an extended period of time and would "recalculate" even if the car was on the route it had ordered in its irksome, strangely accented voice. This presented a problem if one was, for example, stopped at an intersection with a roundabout and needed to figure out which street to turn on out of said roundabout.
This wasn't its only problem, either. It would lose its signal, send us in strange loops, etc. And it drove us crazy.
So, the Garmin has been replaced by a TomTom. It's not quite as fancy a model as the Garmin -- it doesn't speak street names, just directions -- but at least so far, it's working better for us.
And lest someone argue with the change of brands, I'll mention I know multiple people have had opposite experiences. To each his/her own GPS, I guess.