I bought a Navigon 70 premium about 2 years ago....I'll never buy another Navigon product again!!
The first one would take 10-15 mins to find the satellites and then wouldn't charge so it went back to Germany at my cost. I had it returned to me with a repair report.
The second model - repaired - is chock full of glitches.
It doesn't take a full post code - only the first four digits/letters - which only gets you to an approximate area!!
It sometimes freezes or spontaneously reboots - usually when you need it the most! It seems to overheat.
The suction window attachment only works when warm!!! The rubber is inflexible when cold and so in winter it can't be attached until warm?
The TMC feature rarely if ever works - very annoying as this is a primary feature.
Today I wanted to go to a big hospital in Bristol and it's not even listed in the Points of Interest under Healthcare. It's a big hospital for Gods sake!!
Today was a bad day as the charger also broke where it attaches to the unit! A new one will cost me £20.
When routing it underestimates the likely time of arrival. If travelling for one hour, add 10 mins is my basic rule for this.
I could go on and on, but you get my drift....it's basically poorly designed unreliable and crap!