Just finished 45 minutes with them out on a walk. They are definitey ETYs, very detailed, very nice, never harsh, but in no way a warm IEM. Having said that, I did need to turn on the bass boost with my Touch, but with that added, tracks from the Beatles (Something), Steve Wonder (Boogie On Reggae Woman), Christian Scott (Rewind That), Ziggy Marley (Love is My Religion), Fine Young Cannibals (She Drives me Crazy) and Jackson Browne (Fountain of Sorrow) all sounded outstanding, crisp, clean and very very detailed. Ety has a $79 winner here in my view.
The MC5s, as the photos show, are nicer versions of the im616/716, but thinner sound tube (Almost Shure/Westone/SM3 thickness), and with the UM56 custom sleeves, they are as comfy as possible. Funny, but they do stick out pretty far, but I don't care, they sound fantastic, reminding me of the Fischer DBA-02s to some extent, but at half the price.
Again, out of the box, I needed a little bass EQ tick, but nothing too severe. And since I sent back my Cowon J3 (upgrading to the 32GB version), I don't really have a player with a great EQ. However, the Touch bass boost did not distort on the Etys, as it does with other phones. All in all, this is truly a winning Ety. Not sure it deviates all that much from Etys past, but for this price, it's a step up from the er6i in my view. It's also a better phone than the ADDIEMs, which are the same MSRP.
If you are looking for a detail monster, this is the under $100 IEM to get in my view, based at least on the ones I have heard/owned. I didn't try any of the stock tips other than the small triple flanges that come on the MC5s (no seal). But it has the usaul Ety tips, one large triple, one small, one large gray foamie and one of the glider tips.
No one is gonig to buy custom sleeves for these, but I have to say, it's a great match. My guess is you can always move to Complys or Olives if the fit kit isn't good.