I have the E03 for 2 years, not bad, provided to a real headphone becaufe the original is not great. Jai had a doubt about the food, I have changed. The reception is monaural. In these prices the other models I tried are of similar quality. (Poor headphones, power limit, mono reception). BUT ... issuance reception is very good!
So start shopping for a low, one can afford to offer a real headphones (mini-jack mono) and possibly a power supply is still well below a large system.
So this material is not unusual in itself, but with a little savvy, you can make something very good for cheap