Yes, it is effective. Actually, what I did was chorusing, not shadowing. I read aloud a text at the same time as a recording, trying my best to imitate the prosody of the recoding. It's effective both for improving your prosody and for memorizing a few chunks of language.

(shadowing = repeating a phrase at the same time the audio is played; no pause or delay - exactly the same time) Yes, I used it as a substitute for chorusing, and I think it's useful,  but not as useful as just repeating a phrase after listening to it.

How are you Hamza...
Would you explain what does the shadowing method mean?