I have to agree with what Jamesta is saying: try a lot of "house sounds," from reputable and history-rich companies such as Shure, Sennheiser, UE, Westone, Audio-Technica, heck, even Sony. Best bet is to go for the second highest model, or the middle model, for best bang of buck (technology and tuning design that's watered down from the top model, but still affordable). Then play around with budget/value brands for a while if you are interested. You'll have a lot of fun doing that, and gain a better understanding of what you want and what different IEMs have to offer. It's a process that's basically never ending, but eventually you'll want to settle down with a few sounds that you like the most, (like me wanting the Shure sound) and then you can get the top models with those sounds, plus one flexible/suitable-for-all-genre custom, and then you can finally retire from head-fi, occasionally returning to pick out some FOTM equipments for fun.
But to directly answer your question:
My first pair was the E2Cs, which distant memories remind me of the Meelectronics M6, which is to say they weren't very good ($100 vs $20). They felt under-driven constantly, dark and veiled (in a weak and bad way, not like the relaxing and smooth IE7 way), and muffled.
My next up Shure was the SE310, and they were a huge step up. The sound was clear like a mountain spring or the morning dew: they had little bass, not very full or embracing sound. But definitely not muffled. The mids were smooth and intimate. The highs were capable yet polite, with slight roll off, and felt placed further away.
I'm thinking your SE115s probably sucked a lot to make you so unsure of the Shures higher ends, like the E2Cs did to me. Shure just replaced the 115s with the SE215s, meaning the SE215s are now the lowest/cheapest IEMs on the Shure line-up, while the SE115s just got shoved below the lowest grade Shure IEM. (imagine that.) But one thing you should know is that no matter how much you spend, Shure will always carry the Shure sound, the 535s are not going to excel in songs that, say, the CK10s excel in (almost half the price). But they do everything above-average, with a polished vocal and very emotionally involving sound being their strength.
One thing for certain is that, the level of details on every high-end IEM is about the same. It's just a matter of how the frequency ranges were tuned, e.g. a more powerful bass may distract you from noticing the sound of one celo scraping slightly against the wooden floor of a stage, but nonetheless the detail is still there if you listen intently for it. Things get messier when you compare BA to dynamics, and then there's dynamics that sound like BAs and BAs that sound like dynamics. But I won't deny you the fun of figuring them out and finding your true love.
I realized I haven't really taken a stance on whether you should get 535s or not...I don't think anyone ought to, except to let you figure out things yourself (you can always trade/sell equipments here, trial and error)....hope this helped. (Anyone actually read this long a$$ ramble?)
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I was on the edge of buying the SE535 yesterday when I was looking @ them on 6th ave for 370.....but given that I'm not a huge fan of the SE115 I hesitated. Now I know it's impossible to compare those two as they are in different leagues, but I keep hearing about that "muffled" shure sound signature and I hesitate cause I don't like it on the 115 and I would die if I received the 535 and the muffle was still there lol. I'm curious if you could give any comparison as to the degree of difference between the lower end shures and the SE535.....because from an aesthetic, durability, and customer service reputation stand point I would have no problems going with the shures. Thank you for any further input!