Navman iCN 510 GPS Receiver

I bought a Navman icn 520 recently from ebay. This is the first sat nav i have ever owned so i cannot comment on how it compares with other sat navs.
I found this sat nav VERY easy to use. it was easy to work out what to do (even without looking at the manual) it has got a decent sized colour screen and is very clear. It is also able to adapt if you take a wrong turning and re routes itself. The voice commands are nice and clear and easy to understand. I also bought an external ariel to boost the GPS signal and it works great. I would recommend allowing it to search for available satellites while the car is stationary as it is able to find them much quicker than if the car is moving.
For anybody looking for a good value, easy to use sat nav then i would definitely recommend this model :-)