The offline maps come from "Here"... so of course "Here we go" is offline. We also get traffic info, but of necessity that data is downloaded on the go because its fluid, and changes from hour to hour. There is also a decent "Nearby" service which will show essentials like eateries, petrol stations etc, as well as public transport.
It doesnt alert you to overspeeding, and I don't think it does speed cameras either. But it beats the hell out of Apple Maps and Google (IMO). Likie those, however, it does also give you a desktop version in a browser which is pretty nice, for those who just want to plan ahead without having to download an app.
Sygic was my gold standard... I'm really disappointed that its become stupid.
"Here" is free. Waze is free. Navmii is free unless you want extras like speed cams in which you pay the princely sum of $7.99. Once. Removal of ads I'm no longer sure about, you used to have to pay for those but I dont remember if the recent download even had any. Here and Navmii are both offline if you want. Waze is not, IIRC.
Downloading Metroview again right now, because I havent used it for at least a year. Perhaps it has improved to the point where I might choose it over the others.
 notice that live traffic in Metroview is an IAP. Thats OK, I never need it, I know traffic is crap around Newcastle. LOL. Seems to be free in "Here"