They actually built the HERE engine into the native Windows 10 Maps application, so you get it back, nearly all of it.
As a heavy HERE user, I was not happy seeing them leave, since the Maps app was abysmal. But since then, they've really improved the app and added many HERE features.
You still get the offline maps, you still get HERE mapping engine, you still get the navigation, audible speed limit warnings, live traffic.
The only thing they did not add is the full commute feature as HERE used to give on a live tile. Still work in progress, but it's now formidable.
What was bad for me was having to migrate all my favorites and manually enter them into Cortana from HERE website.
IMO, maps is nearly as good in its current state as HERE suite was. I did not use HERE Transit, so I cannot comment on that one.