Far from perfect, but definitely a bargain for the price.
For $6, how can you go wrong. The GPS-enabled map and navigation alone makes it worth the price. But I also loved that all of its data was available offline, so you can look things up without an ultra-expensive international data plan. Loved the wikipedia entries! Very clever.
There are some improvements Id like to see, realizing that some of these may come at an increased price...
* Better maps. A lot of the smaller streets were not named, and this sometimes made finding locations difficult. There was also at least one misspelling (though unfortunately I cant remember what it was and foolishly forgot to write it down), which made me pretty confused. The freebie tourist maps have more detail than this one, so perhaps that can be your guide on the level of detail to include.
* Allow the itinerary to have different starting and ending points.
* Better indication of which information was submitted by professionals versus tourists. I was also unsure how the information had been verified --- certainly it seemed that many restaurant entries were just entered by other users, but this made it hard to trust the listing. In submitting the information, I had a hard time getting it to use my current GPS location in the location information.
* You could more than double the price if you were to integrate it with TripAdvisor (but still in offline mode, or at least with some capacity to download partial reviews). Id easily pay $25 for such a capability. The main way I used the Internet access at my hotel was to look up restaurant reviews on TripAdvisor. It was a great help in picking nice places to eat, most of which were not listed in the guide.
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Rome Travel Guide (with Offline Maps) - mTrip