Just got my Brainwavz B2 and find the details better than my S4i. Compared to my HD 598, obviously they are not as wide, but they are deep, a bit wider than my ATH-M50. They do sound pretty bright, perhaps even lacking in the depth of the sound, but much more tolerable than the R1s. The harshness/sibilance don't seep into my ears too hard, but after listening to a track that presents a bit of sibilance, it does get quite fatiguing. Most instrumental tracks sound fine, sibilance from vocals are controlled as long as the volume isn't too high, it's not as sibilant as the S4s which is a good thing. The bass is not booming, but with tracks that use a good amount of bass, they start to sound pretty punchy. To be honest, I do not feel the energy of the music compared to my S4s, but they are definitely more clear, raising the volume would add the extra depth I need feel the full energy, but if the music is sibilant, then it gets noticed and can make the music less pleasant (with factor to the revealing aspect of the IEMs), not to mention that certain parts of the music sounds recessed (I cannot pinpoint where). IEMs sound enjoyable with high quality music that surrounds the stage, moderate amount of bass to added energy, low sibilance. Not so hot on rock, metal, pop and other more focused in a direction type of music due to it's revealing and spacious nature.
 
My ears are not adapted to the comply foams nor the silicone tips as opposed to the Klipsch oval tips, so I get less of a seal and comfort, but it's still more comfortable than those circular tips that do not even get into my ears. I still prefer the silicone tips over the comply, the music sounds more fun on them. They seem pretty brittle too, just as much as my S4s, so I fear for the worse for them after a year.

Overall, I find these headphones eh for it's price. Comparing them to the Image S2m, they sound more expansive. On depth however, the S2m sound more full at equal volumes without an amp or EQ. The R1s lack clarity and quality when compared to the S2ms, but at higher volumes, can make up for their loss of depth, and with extra spacious sound, immediately become more deep. Bass is strong, sometimes even distorting the music, and parts of the mids sound recessed. Although sibilant at times, it's not intolerable. Using the EQ to increase it's mids and reduce a bit of the laws and a Fiio E6 (and switching from the Comply foams to the small silicone tips), the sound immediately became more depthful, and even sounded much better, and with better fit too. Overall, if you are used to full-sized headphones, these IEMs will disappoint. The sound signature is not for everyone, they are not balanced, and do not focus on the highs. They sound pretty poor at the sub-bass level, and can even get sibilant (although not as bad as the Image S4. At $35, I cannot complain too much, but I personally cannot listen to them. I do not feel as they are a true bang for your buck, but even for someone who dislikes their bassy signature, they are at least tolerable compared to other cheap headphones at it's price (ex. average Sony or Skullcandy headphones). At worse case scenario, they lose in depth compared to the S2m, but has stronger bass, less sibilant, and more spacious. At best case scenario, their price for it's strengths and your ability to amp them and modify their sound with the EQ can make them really worth the money.
 
My opinion did not include me burning in these IEMs. Used the Comply foams and the silicone tips (and found that the silicone tips sounded better), used a Fiio E6 amp which made it sound much better and had the EQ increase parts of the mids.

Exception of durability, it has similar PROS and CONS to Klipsch Image S4 (being decent quality, bang for your buck), but weak bass. Compared to the S4 though, the quality is a bit muffled.

For $100, I am completely satisfied with the earbud's comfort and fit in my ears (guarantee one of the three sizes will fit), the sound quality (compared to so many headphones at the $200 range, including Beats by Dr. Dre at ~$300), and the controls (now I use the Galaxy S2, only the middle button works).
 
Unfortunately, after 8 months or so, my first one broke due to it breaking between the plastic wires and the jack (wished it would be shaped like an L, making it more durable). Humid, static, and cold weather will also mess up the volume and playback control. The bass is also pretty weak (it's not invisible however).