So, I just got the VSonic VSD3 (Non S, Non detachable.) yesterday, and I've already listened to them for about 8-10 hours. I have a few thoughts on what I think of them as my first well researched IEM. Needless to say, I am very happy so far.
First of all, the bass. In one word, it's delicious. The bass is huge, punchy, and has great tone. It's just enough to give your music a lot of oomph without overwhelming it. Well, it can get a bit boomy if you're listening to more quiet music (for example, the electric bass on The Mountain Goats' "Stabbed to Death Outside San Juan" is a bit too overbearing (By the way, John Darnielle's voice sounds particularly clear and clean on these) There's something really fun about the bass here, and it's not something I've heard yet (As I'm still pretty new to the audio world).
The midrange and treble are great too. Guitars and violins just sing on these. I think i would describe these as lush sounding with a good amount of attack. Not really "In your face," but there is a lot of presence and energy here. The treble brings a lot of space and detail into the mix, but it can get pretty sibilant. I expect the sibilance to improve with burn in. The VSD3's are a lot of fun to listen to, while still keeping a lot of detail and neutrality in there as well (Don't use these for any sort of monitoring, though.)
The presentation suprised me, with an intimate soundstage that has a decent amount of separation. They definitely don't sound like you have something in your ears, which is a huge plus. You get the feeling of instruments popping into a certain place in the world, and while that space isn't too wide, it's very clearly defined. The isolation really suprised me as well. I'm currently listening to music at a reasonably loud level, and I can't hear my mechanical keyboard at all. Nothing I've ever tried can do that.
One thing that I kind of dread: These are really easy to drive. This means that I can hear my sound card in a way that I wasn't able to before. That means.... Static. I can hear static and clicking that my phone does for the first time, and I can hear it a bit on my computer as well. However, it's not present enough for me to be concerned, considering I paid $45 for them. However, I know that the future of spending money on DACs and amps draws closer...
In Conclusion: Yes. Just yes. I like my Sennheiser Momentums because of their warm tone and great detail. I like my Grado SR60i's for their shimmery treble and addictive mids. These have a bit of both. Maybe the sound isn't as refined, and maybe their flaws are a more obvious, but this is a sound that has the good parts of both of my big audio purchases. And I can take these anywhere and block out the world with them? Pinch me, I have to be dreaming.