Not well made, and probably unfinished
I have a 720, and it's not good. The "A-5thousand-and-fourty-three" thing is infuriating - and just laziness and slackness in the internationalisation of the voice software.
The early ones have different hardware, and don't support SDHC memory cards. Every time you update the map, you lose your favourites, unless you know the h4xx0r trick of copying a file.
When I first got mine, the software had several glaring bugs in it. Fixed by an update, but indicating that it had been launched too early.
It flips to night colours in the dark, but won't flip back in the day.
The FM transmitter is weedy, and won't give a clear signal in any car I've tried it in.
The battery is an ornament. After an hour, it's looking low - but there's no on-screen alert until its about to go. Charge time > use time.
The locations of motorway sliproads are wrong, so that if you actually tried to leave when it says "take the exit" you are too late.
Some features are buried in the seetings menu, and there's no way of customising the available features for a novice to use.
All the sockets are along the bottom edge, so it won't sit on the dash in the car. If you put it too near the dash, the connectors will be damaged. There is no proper in-car docking cradle available. The right-angle USB plug on the car charger merely ensures that the USB socket will be damaged if the cable is pulled.
And mine died, and TomTom are being very difficult about fixing it. Customer service is poor.