herewith my thoughts on the hisenior b5+, a 5ba unit which costs $100-160 based on shell and cable:
1. packaging and accessories are rudimentary--this is scarcely the orgiastic unboxing experience of say, rha or trinity--the earpieces arrive in a plastic bag with the cable and a variety of tips.
2. the stock memory cable is maddeningly inflexible and awkward to use; odd-angled nozzles make fit a bit finicky, although comfort is good and isolation above-average.
3. build is unflashy but solid, with good quality acrylics. the clear, logo-less unit (which i bought) looks like a diy project and is singularly unattractive; the black and red/blue units seem more attractive.
4. as noted by hungrypanda, the b5 is extremely tip-sensitive--foams flatten the presentation and remove the already dialed-down bass, while shallow, larger silicons seem to provide the best seal and detail level.
5. their seeming high sensitivity notwithstanding, the b5 benefits greatly from amping and will sound anemic from lower-power sources.
6. soundwise, these are slightly bright, energetic and neutrally-tuned with some emphasis on a very extended highend. note texture is about average. these lack much subbass impact or depth, although midbass is well-chiseled and quick; i keep thinking these would have been better tuned with a more visceral lowend. mids are forward and extremely clear; vocals and strings sound very natural and engaging. highs are sparkly and very detailed, free of shrillness and siblilance; drums and cymbals sound especially lifelike. as a result, these are quite unforgiving of poor-quality recordings--nothing is smoothed over and bad productions sound bad.
7. soundstage is very wide, albeit with limited height; stereo separation and instrument placement are very precise. these do not congest in complex passages and tend to sound their best with orchestral, jazz or acoustic fare and not as engaging with heaviosity.
8. compared to my previous $100 benchmark, the it01, the b5 is less expansive-sounding, bassy and physical, but much more transparent and detailed at the treble spectrum--the it01 sound blunter and less revealing in comparison. compared to their obvious target, the ue900s ($350, but often available for $179), the b5 is more energetic, brighter and presents more highend shimmer and detail; the ue900s has more bass depth, a more holographic stage and is less colored overall; the ue900s is overall superior in the sense of being a more precise reproduction of the music, though not necessarily more enjoyable. the shure se535 likewise has a bigger stage, much more bass quantity and richer mids, but is otherwise inferior to the b5 in every sense, with comparatively monotonic low end and less treble detail.
9. these are clearly tuned to mimic the flat, revealing presentation of "audiophile" ciems, and on such terms they do very well. i'd like them more with a bit more oomph, but am still fiddling with source/tips and will update as warranted.
(also posted on the discovery thread). thanks for reading.