Pros: More ergonomic shell, still the same sound, replaceable cable. Very easy to drive
Cons: short y-split to earpiece length. Memory wire vshort (5-6cm?). Isolation (?) slightly less than with V1.not sure the sound is for everyone(see review)
Aside from the cable and new body, my impressions match what I had in my v1 review.
Otherwise, these sound about the same as v1/the new ear-piece body shape is a lot more ergonomic(seems to be a bit smaller as well, but not as easy to get a good seal... At the same time, I'd rather that, then the huge rectangular shape of V1 tearing my ear up)...
Earsonics also decided it's a bright idea to mark r-l in the same black color on the shell. So you have to squint at the earpiece, or look at the underside of the cable plug to see whether the dot is red or blue.
Now the bad things:
Cable: The memory wire is about 5cm which is a lot shorter than useful for anyone that's not a half-hobbit (about 2x of what it is or, I guess, 10cm is generally quite useful and I do wear glasses, but not when running)Furthermore, the new cable y-split length to the earpiece when worn around the ear is still stranglecious...
It's really quite appalling that Earsonics can't listen to even the most basic feedback and stop supplying short useless crap for cables unless you're a mystical creature with small ears and short neck/small head...
Well, now when your cable breaks in 6 months which it probably will because you will keep tugging it, you can just waste $50 ordering a new one, instead of $150 posting v1 there and back.
edit: I've checked the sockets and they're pretty standard IEM cable ones. To top it off, the sockets on SM3 are not recessed. The cable also solves the problem with the memory wire section being too short and annoying to be useful. You probably also want to go easy and try not to put too much pressure on the cable since they're not recessed sockets.
As for replacements - for example my SM3x6 UM reshell cable fits.
Earsonics again did not include a cable clip... Which for the RRP you probably want and would expect. As you would also expect an manual in English and maybe Chinese? Again, Earsonics only includes one in french.
Some say it's a bit veiled... I wouldn't quite say veiled, it's just you can get a lot less 'meaty' sound in the mids and upper bass, or more subtle tuning that sounds more natural. The is certainly 'fun and detailed' but I'd question 'natural'. That said, I'd probably still take SM3v2 for metal over any HP or IEMs I own(ed)
I'm not convinced the sound is to everyone's liking - people do complain about the veil and the forwards mids. Personally, since my v1 broke, I had it reshelled/driver upgraded into SM3x6 at UMAus (tuned somewhat close to miracle, not the usual SM3x6), and it's a lot more subtle but still has ample (and deeper) bass, sweet and detailed highs and mids that aren't harsh or sibilant... I'd probably prefer the SM3x6 or Mage or Miracle to the SM3v2, despite the marked price difference and some overall loss of 'fun-factor'. (if they made universal versions ).
I used to love the SM3 v1 sound, but now it seems to me like v1 and v2 have 3 distinct peaks in the FR - somewhere in mid to upper bass, in the mids (vocals and near mid-lower octaves of piano), and in the highs (cymbal hits are very ... too sharp)... I may have been converted away from SM3 completely as I now find that sort of sound a bit fatiguing.
Finally, at > $450 RRP, these are not cheap...