I just got the Brainwavz R3 in.
Yep, these things fit much better than one would have ever guessed. I'm baffled they even fit!
How do they fit? Well first of all, BW gives you a ton of tips including a Med T500 Comply. And next, about 3 inches of cable on both sides leading to the driver is memory wire. Bendable and what not. This allows you to mold it to stay in.
So how do they sound? Classicals, good quality classic rock, opera, live performances are gold with these things. They are similar to how S-Logic by Ultrasone works in that the sound(especially the lows) are farther away and slightly reverberent. The R3's do have a bass end, but its bass capabilities are more similar to say the Vsonic GR07's in that they are there and are fairly tight, than to say an XB500(XB stands for Extra Bass if that gives you an idea). They are very clear sounding but are not fatiguing in any of its mid to high freqs and are not too analytical so far from what I've tested
Live performances, the classics, and well recorded classic rock is pretty phenomenal with the R3's. What is missing from say comparing this to an IEM say the Heir Audio Tzar class($300-$400) would be that its still lacking in refinement and that this is still more based in consumer musical enjoyment rather than being purely analytical and showing the user what may be more wrong. This is pretty good for most people's cases,but lots in the audiophile world want neutrality. The R3 also has problems with mainstream genres like hip hop not in that it falls flat on its back, but in that it presents it too cleanly. Hip hop and rap is supposed to deal and be enjoyed with tons of bass and warm sound that fills the empty space. The R3 presents too much empty clear space that the hip hop doesn't fill and doesn't have the bass capabilities to keep up in enjoyment.
This is just initial impressions. My full review will have better grammar and English. I promise. I'm dropping lots of ideas of audiophilia without explanation of what that exactly means.