Vantaggi
Depending on how much you push to learn more and take classes with top professors (instead of worry about grades, unless you have to), you can learn high end practical knowledge and gain experience with state of the art equipment which apply to a wide variety of industries. I learned from physics, robotics, mechanical, materials, bioengineering and civil departments and worked with many instruments for different projects and almost everyone is supporting and willing to teach or work with you. Of course you have to communicate and link with labs and different scientists to in order to work with them but that’s all part of the PhD journey. It’s a highly valuable experience that trains you for problem solving, you learn all the fundamentals in classes and apply them hands on in lab settings. Just prepare for living a minimal life for 4,5 years or with family support and you can do a lot after PhD. This doesn’t mean that there are a lot of jobs out there for PhDs as it becomes a very specific application, people say tenure track is a stressful path but some like it, and instructors don't get paid enough but have a path, if you get a job in industry you’ll be very successful imo and that depends on the disciplines that you practiced, so just train for something that has a big industry like tech, pharma at this time.
Svantaggi
Low pay for PhD researchers, income is number one stress factor (apa, 2015) and PhD researchers could perform better with more benefits