the factory navigation, how well do you like it? Would you recommend it
Having had a '13 GT since August, I would not recommend it. Yes, it gives a more integrated look than a portable Garmin unit. Yes, although the voice control is not truly prime time I have not met one that was, regardless of manufacturer.
Still I have found the Tom Tom would have gotten me lost one one occasion had I allowed it to, and DID get em lost on a second occasion; being able to recover only because I had looked at a GOOGLE map at home prior to departure and so realized where the street I wanted should be in relation to the circle the nav system was sending me. In both cases the areas were established at least 7 years and located in or near the nation's capitol.
Depending on what you buy, non-built-in systems come with for-life map updates. This has become an ongoing cost with the Tom Tom OEM system. I admit that I am not familiar with the systems flogged by other makers and so cannot say whether this is a universal problem.
Finally, when I explore over long distance I'm responsible for the safe operation of the motor vehicle and my co-pilot is navigator. She has pre-plotted the route she wants to take on the PC; taking into account POI and convenient locations for fuel, food, and nature before loading these into a portable nav system. Once on the road local detours are handled on the fly. All this...but NOT with the Mazda Tom Tom. You cannot load into it routes planned elsewhere, and you cannot make changes to the route or plot a new one while underway; you have to stop.
As to getting lost, when we travel we carry paper charts in the same way we have a plotter and paper charts on the boat so we are prepared. Having to pay for map updates feels like a gouge when compared to portable systems. The inability to load other routes and make on-the-fly changes from the other front seat is a deal breaker for us. It is not clear to me whether my salesman would have been able to answer these nav system questions, but I failed to ask them so the fault is mine. Doing it again and given how my family uses a nav system, I would not buy the installed Mazda system nor recommend it to other buyers.
Brian