For €24 it's an exceptional purchase. The material of the earphone is poor. . . but it makes the headset feel light, the microphone needs a pop filter but if you have one it will be perfect, quite clear on the mobile dongle although I haven't managed to get it to work on the PC, also it's a bit tight if you wear glasses.
The sound signature has stronger bass and treble than I would like, and the mids have their own space, although they can be equalized.
Its app on the PC sometimes fails, it's good but it doesn't have a preamp and doesn't tell you how much battery is left in the headset, although the dongle is very good and stable and there's no noticeable latency. I haven't tested it on Bluetooth and have preferred to use it via the 3.5mm jack. 5mm on my PC and with a good, well-preamped sound card, I was able to add a warmer and softer VShape to the treble, and it sounds great.