You can save maps and routes for offline use.
That's not very practical to be honest, I prefer the option of having maps and POI on my phone/tablet.
For me Sygic so far is the quickest and most accurate, but I will check out some of the propositions from here.
I'm gonna test out the hud thing today, it looked good on the videos.
Edit
When it comes to Live traffic - Tomtom's traffic is the only one worth paying for. It's used by Tomtom, Route 66 and Sygic. The implementation is crap on Sygic, however, so I don't recommend it. Next best is Google which is free, then Waze (also free). Hence all the other apps' live traffic info is not worth paying for.
I agree with you that Sygic isn't the most user friendly app, but it's not that bad once you get use to it. But so far from only testing google navigate, route 66 and sygic... The implementation on route 66 IMO is superb and generally those small things such as the camera movement when you get to a roundabout it moves to birds-eye view. I've tested out the route 66 on the 30 day trial while having sygic on my phone, I'll look into Route 66 further more when my Syigc subscription ends.
P.s. I can't say a bad word about Sygic since I got it for free, but if I had to pay for it, than mostly like I wouldn't.