I bought the E1DA Cosmos ADC as part of my audio measurement equipment because it shows very good performance figures and is designed for this application. Of course, the ADC is also useful for any other ADC application requiring high performance.
So far, it seems to deliver exactly what it promises.
Some suggestions for improvement:
The high level input is extremely useful and one of the reasons I bought this device, but the 2.5mm TRRS interface is difficult to deal with in my opinion. I would prefer to have high level input on the XLR connectors instead.
In order to change any settings, you need to install the tweak software on your PC. I would prefer buttons on the ADC itself for quickly and conveniently changing settings (like mono / stereo mode e.g.).
I understand that variable and pretty low input impedance is a trade-off and required to reach high performance. Just keep in mind that this a challenge in some (rare) applications. I designed a buffer to deal with this. A symmetrical power supply output for powering such buffers would be nice.
Overall, I'm very pleased with the E1DA Cosmos ADC and would recommend the product.
And I'm also pleased with how Linsoul handled the transaction and would buy here again.