Pros: Style, Comfort, Sound
Cons: I dont really find anything major, as for sound is really subjective and dependent on gear paired with these headphones.
I will try to keep it short... I guess...
Tracks I tested on these were 320 vbit mp3s and flac, random genres with some of my favorites in Electronic, Dance Pop, Rock, Alternative and Enka (yes I'm weird). Source units - Sony Xperia, Iphone 5S, Fiio E07k as amp and dac/amp.
Style and Comfort - It's a major win in this department no questions there. Looks good feels really good unlike those super clamps of death.
Build Quality - Although it looks fragile, the unit is acutally very sturdy/robbust. As for the pleather parts of the unit (headband and ear pads) its a given that these will naturally degrade from wear and tear over the years (there are some that worry so much about these which is not a big deal really), but you can order replacements from sony if its available or amazon if you are in the US. As for the jack rattle issue well it really isn't an issue and I mean it only rattles if you vibrate the cord manually not to say you may look like you have some kind of mastur.. fetish... in public... I even hop and dance around with these when no one is watching and it doesn't rattle. If its really an issue for you buy a superthin bolt washer ring and plug it along, problem permantly solved with a less than .005 cent ultrathin rubber? lol
Sound Quality - Ok the mk2's are a bit of an upgrade from the orginal 1r's in this department, I had the chance to test the units side by side on the Sony shop I bought this from.
The bass on the mk2's are better compared to the original which was near dead weight as the mk2's have more punch and clearly more audible but it doesn't have the extention nor the super detail like some openback headphones do (note these are meant to be portable, if you buy this for house use then you bought the wrong pair and also these are not boomy headphones like the XB910).
The mids are clean,clear and very detailed as this phone is more focused in this part and somewhat comparable to the original 1r's since I can't hear any major difference between the two.
The High's are also more audible compared to the original 1r's which is a little bit recessed and detail is also clean and clear but again not comparable to open back headphones on the $1k range. But for a portable and given its price range, this is very good.
Soundstage on this actually decent for a closed back portable and not that packed in like other closed type portables, the instruments have clear spacing between them and not sounding like a wierd disco jungle and the detail is also present unlike other portables where you can merely hear a slight sound of the instruments.
As for amps this is very subjective, so I suggest try it around with portable amps and pair it with what you like. There are good affordable amps out there and if you like to go hi-end its also there, so try around and hear which fits your wants.
If you are looking for portable with style, comfort and good quality sound then the mdr 1rmk2 wont fail you. (again the jack rattle issue isn't an issue, I dont even know how it became an issue to begin with? maybe the those sample that some reviewers were testing were to so worn out from wear and tear? the brandnew one I bough from Sony had no issues in regards to build quality) and if that really bothers you causes a wierd sensation of whatever fetish rattle of an issue for you then get a freakin washer and plug it in along the jack, no mods needed.