Years and years ago I bought the lifetime license for Sygic, great offline navigation system.
Having said that, my lifetime license became a bit obsolete when they came up with the Preimum+. I can still use the apps and have the maps but any new feature I have to pay extra... and really, all the new features at some point were included, now they're extra.
So no, I don't think I'd recommend it.
Also, same as any other "offline" navigation, you won't get traffic or data of shops, etc unless you're online. At the end of the day, you can do the same with google maps by downloading the maps before hand.
Not saying that it's a bad app, just saying that you should have the right expectations there.