Pros: Clarity. Sound Stage. Comfort. Life like.
Cons: Cables tend to oxidize over time (turn green). Muffles high-end. I change them every 6 months to a year.
Previous IEM was the Shure 530, which I'd thought was good. The UE11 Pro was a revelation. Music sounded clearer with a better sound stage. I listen to loss-less digital off my Mac thru an off-board DAC. Base does seem to be heavy directly off of iPad or the Mac. This goes away with the Off-board DAC revealing deep solid base with tone and pitch. The supplied cables tend to oxidize over time. This tends to muffle the high-end and loses detail. I replace the cables every 6 to 8 months (or when I realize it needs new cables). I am very happy with these.