These are the first Westone's I have owned. I was looking for something that would be an upgrade with a similar sound signature as the Audeo PFE 112, that I bought last year. The Westone's seem fairly well balanced with none of the lows, mids or highs being what I would call forward.
Congrats on the Westone 4rs. I'm a big fan of Westone products, having previously owned UM-2s and currently very happy with my Westone3s. Have you used other Westone IEMs? I'd love to hear your impressions of the 4rs. I haven't heard them yet, but from everything I've read they seem really nice. I'm also sort of looking for some active noise cancellers, although the Westone3s have served me very well on many flights including a couple of longer international flights