Time to add my $0.02, since they came in for me today. Right on time as a nice birthday gift for me. Though.... Well...
Ergonomics:
Oh boy, are these ever comfortable. Very light, very soft, very comfy. You could wear these all day long as so long as it isn't so hot outside. These are definitely circumaural and not supra, unless you have large ears. I really do wish Sony would take a cue from Sennheiser and go with velour earpads however. They will trap heat inside like nothing else, especially when it's nice and hot outside (like here in Los Angeles). The earpads on the level of MDR-X10 comfortable, though not as crazy as that guy is. However, it does remind me quite a bit of MDR-X10s in another fashion...
Construction and Accessories/Extras:
Not so much in the way of, though it comes with 2x 3.5mm M/M, one of which is the TRRS variety for universal smartphone use, the other is a standard 3.5mm TRS M/M. So you have that option there, as so long as one of the M ends is suitable for iPhone (original type). The carrying case is nice, but a hard case or a zippered case would've been much better, as the headphones feel quite fragile. As it has been noted in this thread many, many times, it's made of matte plastic, which isn't too much of a problem. Sony's plastic headphones are of magnitudes more durable than most (say compared to Beats), but it does feel a bit light and flimsy. One would be quite worried, and rightly so, if one had paid full price for these in terms of construction. These are marketed as mobile, as there are not 3.5mm to 1/4" converter. Odd that, but there you have it.
Sound, Initial impression:
Here's where it reminds me very much of the MDR-X10. Very bloated bass, especially towards... 80-200Hz area. Listening to couple of tracks on various mobile sources (iPhone 3G, Galaxy S3 and Galaxy Note), the 80-200ish hump is noticeable. And the mids and vocals are quite recessed. All of these has been noted in the thread so I'm waiting these to break in fully and see how they turn out. I would like to try these amped, but I have a small feeling that amp'd won't make that much of a difference. Pretty good when it comes to soundstage, but the extended to bloated bass kind of kills any sort of details that would've been noticed. These right now sounds like a very slightly refined MDR-X10. Not sure if that's necessarily a good thing however.
(Edit 1)
6 Hours in (with random music):
Bass is much more tamed, especially with straight TRS to TRS cable as opposed to the mic'd TRS to TRRS cable. Vocals are more apparent and takes its place in the center while the flabbiness is toned down quite a bit. So there's more of a balanced presentation. Low bass is has a bit more impact but not in the X10 or Bass Flab kind of way.
(Edit 2)
15+ Hours in (with random music)
Not much change. Bass tightened up from initially but not that much. Mids and trebles feel like they are veiled further back. I have enough for judgment.
Final impression:
These are the darkest Sony's that I've had the pleasure(?) of listening to. Now, dark by no means is bad nor evil, but it's quite unexpected from Sony, who's sound signature has been balanced to bright. The closest headphones that I could compare these to? Probably Audio Technica's ATH-ANC7bs or the XBA1s. . But those are quite a bit brighter than these with more bass. Even the MDR-X10s (not even in the same category of headphones to be sure) aren't quite dark as these. This unexpected signature towards the dark side of things is why a lot of people give flak for these, I think. This sound isn't what is expected from Sony. If these had a different manufacturer or a different model number, they would probably be more regarded. However, with the model number that harkens back to the nigh legendary MDR-R10s, it's just setting up for failure, or a big disappointment to say the least.
It's probably colored to fit the consumer/portable use, so that it's a bit of a jack of all trades master of none. That is how I'd classify these cans. They are good for what it is, and if the users did not use other mid to high level headphones (or their only exposures are from Beats or the ilk), then they'd see this as a "premium" set of headphones. At this price, though, there are better alternatives. And I think you know most of those alternatives.