This is pretty much rebranded Sonicast Dirac mk2 which is very famous in Korea for its very clean and accurate sound reproduction. I think this will compete well against other single driver IEM such as Moondrop Kanas Kxx.
dk4everThe Dirac Mk2 comes in standard and "+" versions, with the latter tuned toward neutrality. A Radsone Facebook post mentions a long development process with Sonicast, suggesting yet a third tonal balance.
bloorHi, the driver inside HE100 is an upgrade version from Dirac MK2. HE100 delivers more balanced sound. It also features some special structures that relieves ear canal pressure and prevents diaphragm distortions in cold weather. Please find more details here: https://www.radsone.com/he100
Radsone_EmilyI just purchased 2 of these on Amazon & can not connect to devices via Bluetooth.. Only the app will connect to the ES100. Radsone has not replied to any of my emails.