I recently got the Piano Forte, steel version, and was pleasantly surprised by how the sound fit more genres than I was expecting. But it's true what they say - that they fit songs with more overall ambiance rather than thumping bass lines and harsh vocals. Still, given how ambient music, for example, can be so based in electronics, I was surprised when these earphones, being known for good rendering of acoustic and other natural tones, actually did quiet well with ambient tracks. As an ambient music fan, I was enjoying myself with these. And even some kinds of pop music worked surprisingly well with these.
I'm more used to the V shaped sound of the TH-900s, so these were a huge change of pace for me, as they have a more A shaped sound, putting the mids forward and then layering in the rest. But for me, it was a fun adjustment to something new, rather than an irritating struggle with my previous expectations of sound. Your own mileage may vary.
That said, yes, some rock and pop sounds almost tinny and certainly lacks something. Also, I was less pleasantly surprised by how unforgiving these can be. I don't think I have heard an earphone type less forgiving of a poor or flat sounding recording. I had thought that their unusual configuration might add something to some of my more bland tracks, but instead, they just made them worse than ever.
I think this may have been because of what these do excel at, which includes the ability to divide the mids from the other sounds and give good separation in general. If a recording is a bit flat and compressed though, then it has little to work with. But when a recording has plenty of layers to explore, these earphones unwrap them in a wonderful way that I had not heard before, almost making up for how arguably overpriced they are. These have even helped me decipher some lyrics that have confused me for years when heard on other equipment, not through clarity and detail, but through the division of the different parts of a track. I also noticed other little effects in carefully layered ambient tracks that I had previously missed.
The more cynical remarks you may have heard about the experience of these earphones are all true too, from a certain point of view - cold metal on your ears until they warm up, a bit like listening to seashells, priced by their looks rather than their sound quality, and not fit for many popular genres.
But personally, I sometimes get tired of the typical audiophile quest for perfect clarity and neutrality, and want a different experience that involves me with sounds in an unusual but engaging way that reveals things about tracks that I hadn't previously noticed. These provided a height and ambiance to the soundstage plus a separation that was new and engaging for me, making them worth their limitations and their price. But as others have noted, best to give these a listen before making a purchase.