I just got the 2nd generation of the UE18+ Pro-To-Go, and it is amazing. After having owned the Campfire Andromeda, InEar Prophile-8, JVC HA-FW01, Sony XBA-N3AP, Aurisonics ASG-2.5, AKG K3003, LZ-A4, Noble X, that these are the endgame I was looking for.
My first IEMs were the AKG K3003. While coherent and detailed with great imaging, they were a bit too sharp to my ears. I was basically looking for AKG K3003s with less sharp treble. The UE18+ Pros have decent bass, at times it seems like the bass is more solid than my AKG K3003s. With these IEMs, I feel like I get lost in my music instead of picking out the details. However, if I listen more carefully, I hear great separation between instruments, careful imaging, and exceptional timbre reproduction. Kudos to UE for making an IEM with stellar coherency, while retaining exceptional separation and detail retrieval.
This might trigger some, but I felt the CA Andromedas, while pleasant to listen to, had too much of an exaggerated feel...too much of its own flavour to the music (artificially expanded soundstage, boosted bass) - it was also way too sensitive to source impedance. InEar Prophile-8s are nice, but a bit too analytical. JVC HA-FW01s, superseded by the UE18+ Pros. Sony XBA-N3AP - basshead IEMs. Aurisonics ASG-2.5, superseded by the UE18+ Pros. AKG K3003, superseded by the UE18+ Pros. LZ-A4 - no comparison. Noble X - no comparison.