SatNavs..
Actually, I use maps too but because I do not want to lose those map skills. In my line of work, I have to take into account the possible unavailability of GPS through jamming..
Now, SatNavs
Mio: I will *never* buy one again. It took 3 years before map updates were available. Funnily, only the first 2 years of map updates were free - which weren't available. No thanks. A shame, it had the best user interface of the lot.
TomTom: Iive traffic updates are IMHO a killer feature that I gladly pay for. However, it demands more attention during a trip than two small children high on sugar. A GPS should *assist* a driver, not draw his/her eyes from the road with useless confirmations or with menus that are now so long with totally unwanted guff that they require scrolling.
Be careful with big screens and tablets - a larger screen takes too long to absorb, also because designers can never resist filling all that empty space. And when parked, you will find out that map browsing sucks on a GPS (at least it does on TomTom, I guess that's to hide the fact that it likes U-turns more than your average New Labour government). So small when on the road, please.
Last but not least: when will the EU make a universal car interface for GPS compulsory so that both internal and external GPS can get roll data from the ABS sensors? It may make in.car GPS actually *sensibly* priced due to much needed competition - and you can choose your own..