The Tiandirenhe connectors for 2.5 and 4.4mm were bought by me so that I could connect my IEMs to the balanced out socket of my Fiio M11 Plus ESS. And boy do they work.. It would be wise to spend on these connectors as they are value for money in comparison to dedicated balanced cables. Obviously, a quality cord will make a big difference but with these connectors, there is noticeable difference in the output.
Value for money

Work as shown in images

Awesome packing and delivery experience..!

Why pay 8k for a balanced 2.5mm cable?

This works on Fiio Q1MK2 2.5mm to 3.5mm connection.
There is not a lot of noise. Works as expected.
Build quality is OK.
Would be 5 stars if 2 female 3.5mm plugs were provided.

It really makes things cheaper and efficient, I bought it to connect my HD650 to a balanced amplifier. Works flawlessly. Really worth the price.

Quite a lot of portable devices are designed to deliver 2x the power on balanced output when compared to SE. This adapter is useful for such devices, especially if your IEM / HP can benefit from the extra power. Of course a fully balanced cable is going to be better when compared to such an adapter. However, if you're on a budget and would still like to provide the benefit of extra power to your gear, this could be a good option to consider. I've been using this adapter with FiiO BTR5, Sony NW-ZX507 and FiiO M11Plus LTD for more than a week now. Haven't had any issues in terms of feedback loops or source damage.