Satisfied with the product.
The cable is strong and connectors are compatible with Etymotic Er2.
Definitely enhanced the low frequencies.
However, the cable doesn't offer the convenience of standard etymotic cable, which has a compact connector.
1. It has to be worn from the back of the ear, which is inconvenient as this iem is not designed for such placement.
2. the mmcx connector of Tiandirenhe protrudes much farther.

Try not to opt for the TRN pro modular cable, the connectors are not as sturdy as this one.
Decent connectors, could have used a stronger 4.4mm port.

Nice concept.

I'm only using the 2.5 pin termination at the moment for a pair of BLON BL03s. Would have been five stars but the finishes on the pin and connector ends are a little rough around the edges. Also, if you're looking to frequently change the termination, be aware that your eyesight needs to be really good to line the pins on the wire end of the cable correctly with their sockets in the jack element before making the connection, or you run the risk of bending or breaking the pins.

Sound-wise I do not notice any differences between this and the Tripowin balanced cable I was using previously, and didn't expect to.

Tiandirenhe 4 in 1 Balanced Cable For IEM is totally magic made my all IEMs.
I paired with my all IEMs like Pioneer ch9tIEM, Sony XBA Z5 IEM and 7Zteless IEM. All IEMs sounds great 👍 I never heard like sounding IEM with other branded cables which are earlier i was used. Really great comfort and very ease to usage with multi connectors. Once again thanks a lot to TAS for so speedy delivery that is within 20 hrs after placing the order. That's why I given the title Boss of IEM cables.