Got my DMGs. First impression is that it makes no errors of commission. The mids are not problematic at all, and even with the treble nozzles, there isn't much sibilance. There's some treble roll-off, but I'm fine with it. At least it's not fatiguing. My unit has no detectable channel imbalance, thank goodness. I'd hate to have to RMA these.
The exchangeable filters are subtle in effect; there's nothing covering the silver ones (treble), while there is a thin layer of mesh lining the gold ones (bass). The gold ones smooth out the treble response a bit, allowing the bass to be a little more prominent, but the difference isn't night and day.
Overall, instead of selecting the bass filters, I'd opt to use the silver (undampened) ones and use Comply Ts tips instead. But I need new Comply tips, so it'll be some time before I try that route. Because the filter threads are not perfect, I'd want to try to avoid changing out the filters all the time to risk stripping the threads, too. Currently, I'm just using SpinFit tips on them, and already they sound different from stock tips. Stock tips aren't good IMO; they're not very compliant and feel like the cheap silicone tips ubiquitously found in <$20 earphones.
Sub-bass is a bit of a disappointment, though. While the mid-bass is controlled, sub-bass is rolled off. I don't have a problem with the quantity of impact either, but the bass texture is something I'm still getting used to. Feels a little grainy to me.
Soundstage is variable; it's tip-dependent, and ultimately, there aren't a ton of clear directional cues. My guess is that the way it's designed plays a part in this --- the individual frequency ranges aren't piped all the way to the end of the nozzles (to enable the exchangeable filters, of course), and to me, soundstage suffers.
These will be OI-dependent earphones; I'm getting relatively good results from a <0.5 ohm OI source (SMSL iDEA), but I dislike how it sounds from my iPhone 6 (~5 ohms). The difference isn't massive, but detectable.
Keep in mind that I haven't heard any of the well-regarded chi-fi earphones often, so please don't ask me how it compares to the Trn *** or LZ ** or TFZ ****** --- I have no idea.
For $139, I think they're well worth the price. The satin blue housings are nice, compact, and comfortable, and the DMG has definitely exceeded my (relatively low) expectations. It has a pleasant, if safe (i.e. rolled-off on purpose, rather than by technical limitations) signature.
EDIT: Used the included foam tips with silver filters --- this is a good balance, to me, at least. More used to the bass, but it's still lacking sub-bass response (this is coming from someone who doesn't like bassy earphones, but rather dead flat bass response, or at the most a +4.5 dB boost over the Etymotic shelf). These are sensitive earphones too; I'm using them at minimum volume on my SMSL iDEA. Overall, no real shifts in opinion from initial thoughts.