I used independent ERx service many years ago. It was a pain entering patient demographics.
Currently I am working on getting new software from Midmark so that I can run ECGs independent of AC. I agree with above comments about true cost of running a practice. The hours one has to put in to keep it running and have to worry about all the equipment, supplies, PPE, billing, EMR in addition to taking care of patients is "a lot". I was telling a medical student hopeful that if you want to be a doctor, go in for the passion to heal and help and not for the $. There are a lot of easier ways to make more!