Sygic so far best interface and routing, good customization options. But havent used extensively yet. Papago sucks, hideous, voice low, though routing is good. Tomtom nice interface but bad routing and map not up to date. Waiting for Garmin for iphone, to me, ex Windows mobile user, Garmin XT is the best. Too bad, not yet arrived for iphone, Garmin street pilot is only for online use.