OK, so I have had the Mingo's for a few days (both silver and gold). First thing, I had a hard time finding the right tips/insertion that worked. I tried the large stock tips, Sony hybrids, regular silicon tips, foam under silicon, and now dual flange.
I started listening to the gold, but prefer the presentation of the silver wich is closer to my IE8, C710, and NE-7M. Not that the gold is bad, but it is a preference.
Initially I wasn't getting the overwhelming bass shigzeo was talking about, but I did find it with the Sony tips when inserted very deep. These have super smooth mids regardless of the insertion depth, but the bass is greatly affected. I thought the Sony's were going to do it for me, but I was having difficulty finding the sweet spot with those tips, took a lot of work with each insertion. I am sure it would improve with time, but for now I am using dual flange tips which are more comfortable for me and much easier to get in the right position. There is a good deal of bass depending upon my source with the dual flange.
And the cables are microphonic, even just sitting at my desk, so I am wearing them with the cables up, behind my ears. This also helps with the angle in my ear; I am not sure if it is just my ears, but I experienced the same thing with the ADDIEM, over the ear is much better for me from an insertion angle perspective.
OK, how bassy are these? Depends on my source (and tips/insertion depth). With my AMP3 I find the bass is just right, not too strong, but strong enough, tight, deep, just what I want! With my sound card, these are pretty bassy on bassy songs and the overall presentation is thick in the mid-bass! From my SC trance sound OK, but everything else sounds kinda thick.
From the HP out of my Fuze these are somewhere between the SC and AMP3. More bass than the AMP3, but the bass sounds exaggerated and a little bloated (the player, as it sounds similar with my other IEMs). My SC is warmer and has much tighter bass, but is also more laid back and drier in the top end (the gold might be a better fit). With the Fuze it does sound thicker than the AMP3, which takes away from my enjoyment of the IEM with the Fuze comparatively, but it isn't bad at all. I do think they sound very good with trance from the Fuze, save the slight bass distortion. If you are a true basshead, pairing these with the Fuze would be a treat! With the AMP3 these things sound fantastic with all genres!
I can see the issues with the cable construction, there are metal bands (gold or silver) at the plug and y-split which slide around and may become problematic. I plan on gluing these sometime in the near future to alleviate those issues.
More when I get more time to do some dedicated listening.