So I've been loving the W4R. My biggest concern was that they the replaceable cord would be a debacle like the SE535 cord: Stiff, ungainly and swivelly...basically miserable to wear. But no worries: the memory wire on the W4R has been done right! The memory portion is very small and very thin, nothing like the SE535. These are amazingly comfortable! The insertion of the cord is amazing, making the whole shell only slightly larger than the W4. Very impressive. (I do wish the W4R "vault" had a better latching system; I see this breaking over time, but a rubber band would actually be easier, I think.)
I do find that the W4R, as with the W4, is incredibly tip dependent. Even that being said, I "may" "almost" support that the W4R has better treble than the W4. I've been impressed with some real shimmer and extension at time, that I never remember having with the W4. I still find them veiled compared to the GR10 but the W4R is a very engaging and non-demanding sound while being very revealing.
My current tip of choice: Cut down the included Westone whitish clear tips to the stalks. (You know, the kind that almost no one uses...and maybe come to think of it, I haven't heard of a single person using them since they are hard and pretty much suck.) Put the stalks on the nozzle and put over them your Sony Hybrid, so that the edge of the hybrid is flush with the end of the nozzle, or as close as possible. I'm getting an incredible seal and once again affirm that not reducing the nozzle size like the gray mushroom do increases the treble energy (basically the same sonic plus you get from the Shure olives). This sound is very comparable to the shure olive, doesn't risk getting stuck on your nozzle like the shure olive and is way more comfortable, imo.