I have two Magellan units, in RV and in Toad. They are a couple of years apart in generation, and the RV unit was updated to latest software last month. Yet both have the same speaker-muting bug (it won't stay muted), which "speaks" loudly about Magellan's quality control.
And there are other annoyances; when I manually set the zoom level for driving, and the unit zooms in to show close-up of intersection/interchange -- potentially very helpful -- it is unable to zoom back out to the prior level. So I have this feature disabled.
Maps accuracy is not bad, though not perfect. (It's too bad a GPS can't learn about a new road by being driven down it.)
What is frustrating is the Points Of Interest. Both units have Magellan and AAA POI databases. I sometimes find my destination RV park which saves typing it in. But what can be said about neither of them including Yellowstone National Park -- the oldest and largest in the world??? It seems like most major but non-commercial parks and famous sights are not listed!
I have to say that navigation guidance is pretty good, fast updating of current location and plenty of advance and detailed warning of turns.
But I find it hard to believe that Magellan really cares about its GPS products. Costco has been selling a $100 unit that has very poor reviews on the Costco web site. It seems to have problems that my older Magellan units do not have. How could a company allow its products to get worse? (Guess I should ask this of certain RV makers too...)