Yep i did, but after 256 kbit you don't heard that much of a difference by the ears.
Me as a beginner i'm using izotope ozone to make anything ring louder.
Half the people here hate mp3, and even I can tell the difference between a badly encoded 160 and a WAV. I don't have any 320kbps files, I don't have a great listening chain, and if it was up to me, I'd settle for 160 and that's more than enough.