No no no... the op-amps comes with E12DIY are good reputable op-amps, and they sound reasonably good. AD797 is very popular, also OPA604 has a lot of fans around the world.
I will compare them in E12DIY later. I tested the Muses first, because they just arrived yesterday, so curious if the op-amps are in good condition or not, considering the amount of money paid.
System matching is also very important. So we test those op-amps to find out in what setup they sound best.