Yup - I own the Triple.Fi 10, W4R and UE900.
Using all IEMs from a low impedance source with a ZOut of < 1 Ohm, the B400...
... has got about the same amount of bass as the Triple.Fi but with the warmer lower mids and a lesser sub-bass focus in comparison. The Brainwavz' mids are, in contrast to the UE, less distant. The UE has definitely got the brighter and splashier treble.
... about the same amount of bass and lower mids as the W4R (that is just a tiny bit warmer), more level in the upper mids, not as much of a recession around 5 kHz, and the softer and more laid-back upper highs.
... somewhat more bass and warmth than the UE900, is more neutral in the upper midrange (the UE has got a down-slope here), and is a bit softer and slightly more laid-back in the upper highs.