Bests & Worsts Reviews from Amazon

I was looking forward to this purchase as an upgrade to an old Garmin 3150 which had served me faithfully for 5+ years. Ever since I received this item it very often gives awful directions. You eventually get to where you need to go, but it takes you in circles, or makes other baffling mistakes. I tried to fix this via downloaded updates and adjusting the settings, but nothing worked. Some examples: - Driving in a carpool lane in Southern California, the unit advised me to get off the freeway at an exit, then get back on at the same exit (take the off-ramp, go through the traffic light then get on the on-ramp) and get back into the carpool lane - the one I was already driving in. (Thankfully I recognized the stupidity of this and didn't follow directions). - On a visit to a hospital (a 10 year-old facility with no new roads anywhere around it), I was at the traffic light waiting to turn into the parking lot and the unit advised a u-turn, and a circle route that was more than a mile long - all to get back to the same place - but from the opposite direction. (Again, thankfully no need to follow these directions when you can see the building 100 yards ahead...) There have been countless incidents like those above. The result is that I cannot trust the unit. In the areas I know - I can see that the unit often gives awful directions. In the areas that I don't know, why should I expect this to be doing any better? In fact it isn't. You do eventually get to where you're going, but in such an awful way that in general, directions can't be trusted. Even when it's correct, I don't trust it. How can one keep a GPS with this level of performance? The simple answer is one can't. It has to go.