If this is just an update on the previous version of the Maine Topo map, I've found that these are pretty darm acurate.

On a side note, I have an issue sometimes with the turn by turn directions on my 60csx not using roads that would fall under shortest time or distance. For example, if I travel from State Street in Brewer to work (Unicel on Union street Bangor) I usually take 395 and take the Odlin road to cut through and come out the airport entrance. The GPS doesn't recognize that road for routing. It would rather have me get back on 95 and take the Union street exit. The whole time I'm driving down Odlin road, it will read "Calculating...." Maybe there's a setting I'm missing?