HEM2 is one of my favorite single-BA IEM, with a warm lower end and slightly rolled-off top end. For reference, I've also got the following single-BA IEM: Brainwavz B100, Campfire Audio Orion, and MEE A161. HEM2 gets the most listening time from me. They're not a reference IEM, but they certainly are a relaxed, enjoyable listen. When I first got them, I felt they sounded almost like a baby FLC8S in the red-grey-gold tuning configuration. Not bad for a single-BA IEM. Besides sounding good, HEM2 are very comfortable and come with a nice accessories kit. An easy recommendation from me!