Personally, if you still have access to Here Drive, I would use it.
That being said, if you don't have access to Here Drive anymore it will work for you, it's just not as good because:
1) You can't decide what type of pathing you want to use (Shortest time, Shortest distance, somewhere in between)
2) The navigation pane is crowded, the current next direction takes up too much space and when the next next direction pops up it blocks the screen even more leaving you with a little over half the screen to see what's going on. If you put the phone in portrait as opposed to landscape this alleviates the problem somewhat.
3) The longer the trip or the more deviations you take from the defined course, the more laggy it gets. I was on my way to work and about halfway on my 35 minute drive, I found out the hard way as I passed the street I was supposed to turn on that the app was about 5 seconds late. This applies to speed too, so if you're using it as your speedometer, it will lag you as well so be careful when changing speeds.
4) There is no driving mode. I use Here Drive when I'm not navigating just to keep track of speed, where I'm at, how long I've been driving, but this mode is nearly non-existent in the new maps app. You can get to it once you've reached your destination, but it will only show you the map, your current speed, and the speed limit if it exists.
Other than these annoyances, you should be fine... I would recommend downloading the maps before you go though so you don't use your data plan.