Some quick impressions on my last purchases:
LZ A2s: Many headfiers already cover the subject, so I will only add my voice to say that they sound really good, maybe a tiny bit V-shaped, but I don't feel the need for EQ. My complaint is on the shells ( and nozzles ), I find them a bit large for my ears, please LZ could you make an OTE with detachable cable?
Vivo XE800: I already own the GR07 mkII, but I couldn't resist for the price to get my hands on iems that are supposed to use the same driver as one of the $100 champion. They don't exactly sound the same, GR07 is warmer, while XE800 is more on the clear side ( but not bright ) and has a high frequency peak that accentuates some details. Overall really good sound, confortable but the cable is slightly rubbery and I don't like and don't need the remote.
Remax RM-600M: It is a full BA iem, so you don't get the bass response you're accustomed to get from DD, there is also a peak at 3kHz ( guesstimation ) that need to be EQed. If you have these earphones try +3dB at 100Hz and -3dB at 3kHz, it is just a quick correction, but I already get a better FR. Cable is acceptable, comfort and isolation are good.
Rose n°7: Fairly expensive for a DD+BA compared to all the chinese earphones we got lately, but you get a very well made iem, shells are comfortable, fit and finish is excellent. They are well tuned but I find the bass prominent, I prefer a little EQ on these.
YHS 001: I bought these earphones because there was a lot of accessories and the MMCX cable looked good, I'm not disappointed, the cable is soft, flexible with color coded metal plugs, many tips ( standard thin wall + KZ standard + KZ spiral ) and a case. I was ready for a crappy and agressive sound, well no, too much bass, that's all, the iem sound balanced, soft and overall pretty good. Our japanese friends seem to like it considering all the sales on HCK. For the price ( $15 ), that's an excellent bundle.