I started listening to his music this past Summer after I heard him on Wale's More About Nothing mixtape, so far I've listened to his two more recent mixtapes, Burn After Rolling and Kush and Orange Juice, and his second independently released studio album Deal or No Deal. I honestly prefer the music he makes for his mixtapes, from what I've heard on his studio album and his debut major label single Black and Yellow. I get that he can make both sick lyricism and rhymes and also radio-friendly songs, so he'll probably have mainstream success either way. My favorite songs from him and probably, This Plane, Mezmorized , and Timeless.

Wiz Khalifa is that dude..and Currensy is his sidekick...Can't go wrong...its a smoker's pardise

Sampling is normal nowadays, sometimes sampling even elaborates more on the song. Pete Rock and C.L. Smooth's rap elaborated more on Tom Scott's Today:

And sometimes not so much. And I say if you're going down that route, go obscure, don't go already well-known song.

As far as beats go though, the majority of the Burn After Rolling mixtape is using beats from someone else, almost like a cover album beat wise. He's done more creative stuff though, he as a song called "Wuzzup" where the beat is made by him beatboxing which is then looped, the only downside is it's one beat consistently, luckily the songs only like 1:45.