Hello, sorry for the very late answer. I’ve just noticed your tag. I don’t know if you’re still around but the disadvantage I mentioned was only from a personal perspective (not related to the field). Some cords may be stubborn and getting rid of them may be debilitating at first. When I say personal perspective, it’s also because back then (when using Etheric Cord Cutter v1 for the first times), I was focusing on a specific person, so there was some driven energy toward them. Maybe they felt it and “replied” on an energetic level. Independently from the field as well, I guess. And that first field’s description is indeed mentioning some possible painful experience.
Then it went fine and easier, especially after adding Soul Core Restoration, Clear All Negative Energy, Repel Negativity, and such. To complement and add extra protection. That said, you don’t risk any negative thing by using version 1 alone on a longer run. On the contrary.
I don’t have the second/paid option yet but even judging from the description alone, it already comes with extra protective elements (including the persuasion sent to the other person so that they don’t sustain the cords). So you should be fine.