I just drove around with it and it was awful:
1. My house, albeit 3.5 years old, is not on the Maryland map. It's on Mapquest and pretty much every other map I've used. UPS and FedEx know where it is.
2. Every time I make a turn, it initially says that I'm off-route until coming out of its stupor and realizing that I made the turn correctly.
3. When indicating to get on highway exits, it doesn't say on the screen or verbally to get on N/S/E/W, or moreover, "turn now" or something, which is pretty pointless. Even an exit number would be fine.
3. It takes forever for it to lock onto the road; often I'm shown as several hundred feet to the side of the road, which is interesting.
4. The maps are poorly labeled; on an intersection of two highways near me, the number of one of the highways was dumped right on the intersection of the two, making it completely useless to label (being ambigious).
5. The software is incredibly unintuitive, offering no one screen or wizard to simply enter in two addresses and find the route between. Get a clue, Pharos!
6. An unfortunately slicing in the maps made it such that have to load two of them (north and south Maryland) for many routes. I only have 32 MB of RAM in the PDA and both maps take up about 25 MB so I can't install much else.
Anyway, I'm returning it to Buy.com. My first experience with them was good (except for the product) so lets see how the return works.
(I also got a 500VA UPS system today but that's not important

)