I did my masters of Computer Science at University of Pennsylvania mid career. It was the best career decision I ever made. Prior, no company would give me the time of day - couldn't get a phone screen. My TC prior was 60k, and doubled a few weeks after graduation. Doubled again within a few years. I was going no where, maybe some don't need it, but I did.

Was it hard? extremely. a lot of concepts were very old in my memory, but it was also a lot of fun. I enjoyed going to class every day.