I just got these in the mail as part of SGS's tour. Few initial thoughts before I really put them through their paces and do a complete write-up.
First thing before I even put them in my ears is the build quality. I've never actually owned anything RHA, but have heard much about their quality. I have to say, everything I've heard is true and then some if this is an example of their build quality. Now the cable isn't removable, but since getting the Rockets, I've learned that that isn't always a bad thing. However the shells are a work of art, if just a bit heavy from what I'm used to. I actually love the jack. The Rockets are by far one of the best built IEMs I've ever owned with a non-removable cable. But it's plug is too well built, it is actually almost a design flaw. The RHA T10i plug on the other hand is well designed, strong with a spring to prevent breaking. I would have liked to see a 90 degree for when I use my Clip Zip, but for when I use my Nexus 5 or my J3/Arrow 4G stack, it straight plug is fine, in fact it is almost desirable.
The second thing is the overall sound signature seems to be a U-Shaped one. Big bass, almost linear (but recessed in reference to the rest of the spectrum) midrange, and some sparkle up top, but with some rolloff heading into the higher frequencies. Really the star of the show is the bass. I haven't put them through their paces but the bass is definitely the defining feature. That said, from my initial listen the rest of the signature doesn't seem to suffer. The midrange is clear if a bit back from the bass, and the lower to mid treble is very good. The clarity is there, but not as much as some of my other IEMs.