No thanks, never a Mio again
I have bought Mio kit, and the first thing to disappear were the free map upgrades. So I had a brand new device, the promise of map upgrades and, well, no map upgrades. Tech support couldn't tell me anything else than that the device was of a company they bought and they had not integrated maps yet - well, duh, that's the most vital part of a GPS - and then don't promise what you cannot deliver.
About 4 years later I suddenly got an email I could now buy map updates for the device. Buy, mind you, not get for free for a year as was originally claimed to be included in the purchase price. By that time I'd ditched the things and switched to TomTom on an iPhone, which works great because I rarely forget my phone. Map updates are frequent in mini (download) and macro form (iTunes updates of the whole App) - if they had only stayed away from doing anything with social media inside a device that has to work in a car (generic disadvantage of TomTom is that it requires FAR too much screen interaction - it's clearly not designed by people who use this kit themselves, or who see taking their eyes off the road as a safety problem).
Apropos the feature of repeating the last instruction: I don't know of other devices, but TomTom does it by tapping on the bottom of the screen. It also reduces the volume of any iTunes playback in progress for an announcement, and it shuts up when you have an incoming call (which I tend to avoid - I don't like driving and making calls, even though I have very good handsfree kit)..
So, no more Mio for me. There are better alternatives, alternatives you can actually trust..