Listening with the 18+ Pro is luxurious. Like the UE Pro Reference Remastered IEMs, they are well balanced across the frequency range, although a bit more forward in the bottom end. As a reference for panning, there is nothing better. The stereo picture comes alive both from the isolation and proximity to the ear drum. Transients are crisp quick and well-defined, the bottom end is full and punchy, and the top end clean without being brash or overly bright. The low-end presence below 100Hz is slight but enough that I would trust the UE Pro Remastered more for mixing. That said, the 18+ Pro is an excellent IEM that provides an unparalleled listening experience.