I just got my Custom 3 on Friday and also own Ety4p. I find the Klipsch tips--all of them--far more comfortable than the Ety tips with the exception of the "flange" tip from Klipsch but only because after a few moments my ear itches, like I need to take the tip out of my ear and scratch the outside of the canal. But the larger gel tip is just wonderful and I don't even know it's in there.
I don't know if this is because of years of wearing Etys for a few hours each day, but I find the Custom 3 to be quite comfortable and use the various tips for various environs--the larger ones for total isolation, the smaller ones for when I'm out in public and need to hear surrounding sounds.
Hope this helps
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