I have the Echo Indigo IO.(records also)
They are Audiophile quality.
As an example. There’s a sampler called Gigastudio that many classical/commercial composers use ( for movie and television composition mostly)
It comes with a large assortment of very high quality classical instrument samples (for instance I have Gigastudio sample set called VSL (for Vienna Symphony Library) that’s about 100GB. Some of the single samples are over 1gb.
Anyway , there’s a really short list of audio cards that this program will work with (It won’t even run without one of these cards)
The Echo IO is recomended by the makers of this app (Tascam),and they say it’s one of the more stable cards (and most of the audio cards they use cost over 1K!)
This may give you an idea of what this card is. The company ,Echo Audio is very high end.