My HE100 arrived this afternoon and I've had a couple hours to critically listen to them. Ever since I won them I've been wondering what I should say if I didn't like them. Of course, Radsone did this giveaway to build hype, and naturally, if you are given $90 earphones by a company, you will be inclined to find something nice to say about them. However, I can be picky. For example, I read a lot of hype about the KZ ZS10 Pro, but I was totally unimpressed with them and I sold them right away. I used to own the Shure SE535, but I sold those, too. I thought they were nothing special. I was worried I wouldn't be able to muster any enthusiasm for the HE100, either.
Fortunately, I had nothing to worry about. These are fantastic, and easily worth the $90 they are asking. I think they have priced them low with respect to their performance in hopes of making some waves in a crowded market. The only IEMs I have that are worth discussing in this context are my beloved Sony WI-1000X. The HE100 sounds better than that to me, whether the Sonys are used wired or wirelessly.
I use the ES100 as a USB DAC whenever I can since I don't think any of the wireless codecs sound as good. I used to work as a classical musician and that's the genre to which I mostly listen, but I tried them with some Radiohead, Tool, and Tesseract, too.
Impressions:
Radsone is going after the aspiring or budget audiophile market here. I'm not hearing bloated low frequencies or aggressive high frequencies. It's just very clean- and even-sounding. Nothing is objectionable. I like to hear very clear and realistic percussion effects in the high frequencies in classical music rather than a roll-off, and these are giving me that, and there seems to be no trade-off in the bass or anywhere else. I take this earphone as evidence of what a single really good dynamic driver can do. Everything sounds well-integrated, immediate, spacious, and clear. I wonder how much you have to spend on a multi-balanced armature or hybrid setup to get results like this. I really don't know the answer. These are the best earphones I've ever used.
Out of the box, they sound very good, but within the first few minutes I put on some Spiral Dots, liked the sound better, and never looked back.
Is there synergy with the ES100? I guess so. The best they sound to me is out of the ES100 using the USB cable. But I'm quite surprised at how good they sound straight out of my Galaxy S9. They sound great out of my HTC 10, too.
I haven't been out and about with these yet but isolation seems good, but not as good as, for example, a Klipsch X10, which is a deep-insertion, balanced armature type earphone. But the HE100 sounds better for sure.
There is a sliding loop on the wires after the branch, and these can be worn with the cable over the ear, so you can get a good, secure fit and eliminate most microphonics. These are very small and light, which I like a lot.
I don't want to overdo the hype. My best full-size headphones (Shure SRH1840 with balanced cable) sound way better, and my other good full-size headphones are clearly better, too (SRH840, HD650 with balanced cable). Let's be reasonable. Some congestion seems to be a fact of life with IEMs. But these create a sense of space and openness to an extent that I found quite unexpected.
Of course, these are early impressions, but I've been quite curious about them for a while and I'm imagining someone else out there like me who wants some guidance. If it helps, I was looking to buy some new IEMs but I couldn't decide which way to go or how much I needed to spend. Now having heard these, if I lost them or had them stolen tomorrow, I'd go online and order a new pair. If you're looking for an earphone that won't annoy you with bad tuning, but rather surprise you with its honest virtues and versatility, and if you don't want to put a big dent in your savings account, these are easy to recommend.