A PhD is nothing like undergrad.

If you spend time working in a lab with grad students, listen to them. Heed their points about the field and their boss.

Research is research, and maybe you'll have some idea of what the technical details of the field are. But the only way you know what your life will be like is to pay attention. It's not bad, but you're trading something real to have "Dr." on your magazine subscriptions.

My biggest concern is more people getting PhDs, and the process becoming the New Bachelor degree, particularly in STEM.