Best Offline Maps Apps?

Hi guys,

So, I know that Google Maps is available offline, but does anyone else have any experience with other offline maps apps? I'm looking for one that is pretty detailed for when I go hiking. So, a maps app that includes terrain would be ideal.

Also, has anyone played around with Nokia Maps? I've heard they offer a really stellar offline maps experience. Of course, that's not available to Android owners but I'm just interested in what the competition is up to. Anyway, let me know!

-s