Hi enarc
I have a navman 520,its a little bit out when i put my own postcode in -about 1/5 mile, i cant stand the female voice, i sometimes mishear the info given- sounds like she talks through her nose, i prefered the tomtom that i had previously to this unit, more precise wider range of voices as standard & the speed camera warnings installed gave you more advanced notice than the navman one i have -your on top of the things before it sounds and i have adjusted the distance settings -
so thats MY view but others may beg to differ, maybe they could advise you on the MIO
Good Luck