Pros: Neutral sound, sufficient bass (for me), great mid and high (and not bright)
Cons: Weight is an issue on the skull. Un-colored (may not be fun)
This is a very very early review (just a few days from my purchase).
Reason I bought this can is to invest in some home entertainment hub for myself. Initially choosing M50,
but it's out of stock when I tried the demo set over and over and was about to make the purchase. sad.
Then I changed my mind, go for SRH840. Turned out to be not bad. Compared to M50, this can is seriously discolored (what I mean was, the bass is flat, the mid is clear, and the high is just flat, nothing outstanding). Although i still think i would like the more "fun" M50, which is quite bassy and colored (monitoring? I don't know, more towards entertaining). But SRH840 gives me a great chill on what I always wanted - DETAIL. This can is a detail monster.
I'm not even qualified to be called audiophile. Just someone who enjoys occasional music. But I love what I heard. The road not taken was M50, maybe next time (after 5 or 10 years later), I'll find something fun (Maybe too late? Haha.)