got the q40's today and the pandora. The q40s sound really good. the clamp has to be the tightest I have ever had peeerrriiiooood! the bass is above its price but not as loud as I thought. Its still loud though. I was just expecting something way more exaggerated. The pandora bass is just as much and a bit better but the balance of the pandora makes them seem like they are not as gassy because the mids and highs are forward. The pandora is just as loud in the bass and as thumping.
Both are really good headphones.
what amps are you using with the q40 though?