First off, Sygic has a good map. Its colors and fonts are easy to read and view. However, its map is missing many parks and significant locations which does reduce its usability when compared to Google or Here Maps.
Unfortunately, Sygic remains a mess as it still hasnt fixed its many problems. How it handles addresses, gives voice navigation, calculates the routes are just the start of its many problems. Of the several Navigation apps I have, Sygic has a good map but fails everywhere else. Because of its issues that were never fixed, it is the worst navigation app overall that I have - I only keep it for its map. Because there are so many much better navigation apps, I cannot recommend it.
List of a few of its issues that were never fixed: uses a range for address numbers (building or house number often doesnt fit the range), constantly tells you to go straight onto street youre already on, gives last second notice when to turn because it was too busy telling you to go straight, doesnt say what side of street when you reach your destination.