Hm...it'd be much easier for me to describe the FXT90 than the SE215 tbh. The FXT90's bass is tight, controlled and detailed. It has a pretty prominent mid-bass hump and relatedly, it doesn't have extremely strong sub-bass. The interesting thing, is that the bass is very well separated. I think this is what people mean when they say it's U shaped because it doesn't really bleed into the mids at all. The mids are detailed and clean. It also has some fantastic highs that are amazing for cymbals and the like. The SE215 though has more bass and is still a fairly good headphone. It shouldn't be fatiguing as it has minimal treble roll-off and if you dislike "bright" phones, it may be the one for you. If you're a basshead in any way, the SE215 might be more your style. I also think the FXT90 is a pretty damn good all-around for musical genres.
Ok thx this makes things clearer, I'm not a bass head but I am not all that far from one, I did say having an all around was important or came close to saying so by specifying bass, mids and treble all as important. So thanks to Dacrazydude I know the Fxt-90's are good all around iems but has anyone used the se215's? I'm thinking unless someone makes a good argument for the I will go with the jvc's for now and buy them in the summer when I get my job with the police. I do listen to a lot of bass music but... It's still to hard to tell I'm still undecided. Oddly (I don't mean my quick descent from certainty to indecisiveness) FS has the Shure's $30 higher than the Jvc's, but I can PM them so it's all academic. If anyone else has any input it will be appreciated. Damn those companies for making such compelling iems...