I have been using the navkit for a month or so now and I am quite happy with it. I agree with the others, it is not as sophisticated as the TomTom but if you are carrying the N800 anyway it helps reduce your gadget load. I like the fact that the POI icons on the map actually contain info on the place if you select them. I think it is a bit more accurate than the TomTom as well. It is certainly worth the money, also with the new upgrade you can use a larger internal card and keep the nav maps and software on the N800 all the time instead of switching cards.

Hopefully they will continue to develop the interface and the map graphics. I don´t think you will regret the purchase.