I can attest that this language is very hard to learn. It is an incredibly fun language and very VERY descriptive. The hardest part is actually speaking the language itself, since we're not used to using some of the extra sounds that Navajo uses.

Also, single words literally translate into English phrases or sentences.

The language hasn't done much for me these past few years, until I started learning Chinese. It is freaky how similar the languages sound. And I don't mean linguistically, of course. Learning Chinese is thankfully easier for me since I can replicate the phonetics without trouble.