Summary: I use a particular road every day. TomTom/Whereis insists there is a railway on the west side, with three level crossings in 1000 meters. Trouble is, they ain't bin there for over 10 years... The scary part is that Whereis shows the identical error on their internet site. I'm going for a NavMan My50T with NavTeq maps in a couple of weeks.
Summary: As the previous reviewer was saying, I too had major problems just trying to use the map guarantee. I eventually got maps to load but now my unit says the maps are not compatible with my device. I used TomTom HOME to upgrade and also spent 4-5 hours trying to get a simple upgrade sorted. It's the weekend so no support. I'll probably have to spend another 4-5 hours calling support and fiddling on the PC trying to get the unit just to work.