I fall in the more rare category of ECMO patients as one machine wasn't able to process/oxygenate enough volume safely to keep me alive and so I had two running in parallel - making my situation even more privileged by being at a hospital (Alfred Hospital - Melbourne, Australia) that had that availability.
I spent 7 days hooked up to the ECMO machines after my lungs failed due to Pneumonia > ARDS - and complicated by other organ failures. 19 days in total unconscious in ICU. You can read about my experience here - https://www.seriocomic.com/rhetoric/fragility
Clearly, the choice of this treatment/intervention should only be used in the most extreme cases and when there are few other options. But I'm all for having this type of life-saving medical treatment more widely available so that people less fortunate than I can continue to receive the gift of life.