Anyone who has the SM3 and isn't overly sensitive should give the TF10s a listen. I find they make an excellent compliment to my SM3s. I've been listening to the TF10s almost exclusively for the past week and they are a lot of fun, but going from the TFs to the SM3s, I am positively drunk on the SM3s sound.
The TF10s were kind of a welcome relief from my SM3s, which can be a bit overly warm and intimate for me sometimes, and SE215s, which are a touch warm, bassy, and don't have treble worth writing much about. I think I needed a treble heavy phone in my life, because the TF10s wide and open sound felt like such a welcome relief to my ears. Sometimes the SM3s are just too centered on vocals, I just want the mids to bugger off for a second and let me enjoy the fullness of the music with everything coming together; the SM3s can be a little pushy with vocals, because they are at the exact center of the stage and even when the bass or drums come in "louder," somehow the vocals are just right there in the center of the sound, completely inescapable. It's a really special effect that I haven't heard from any other phone, full size or in-ear, because it almost sounds like there is a voice deep inside your head talking to you
but sometimes it's just too much. The TF10s opened my head up to this kind of carefree, fast-paced, aggressive sound without ever being claustrophobic or overwhelming, lots of shimmery sparkly treble without being cold and rarely, if ever, sibilant, a good fun quantity of bass, and nice clear mids. Everything comes together really nicely, well-blended and natural without being muddy, and they don't take as much effort/attention to listen to as the SM3s. They give just enough detail to satisfy the audiophile in me, while still letting me enjoy the music superficially.
But after the TF10s, the depth, separation, and coherency of the SM3s soundstage is just so impressive. I really like the TFs for Infected Mushroom, because they have really awesome dynamics and such an exciting, fun sound that comes closer than anything i've heard to reproducing the feeling of being live at an Infected show. But when I listen to IM with the SM3s now, after a week with the TF10s, I just feel like this is the way some of their songs are meant to be heard, even moreso than a live show. It's like the SM3s create this tiny little bubble of music just for me to autistically retreat into from the rest of the world
The sonic space is just so well defined, everything so well-separated, never muddy or congested. It requires just enough effort to take everything in that it just whisks me away from everything going on around me. Love these little guys
I would say the TF10s sound more "natural," in that they are more what you expect from a really nice IEM, and are very easy to listen to, while the SM3s sound more "realistic," in the sense of being able to create a coherent sonic space. However that space takes attention to fully realize, and I don't always want to be COMPLETELY immersed in my music; sometimes I just want to have fun and dance or bob my head. That's when I grab the TF10.