I did a couple. The first one was unpaid and not in my field. It was fun but a lot of bitch work. Still, I'm glad for the experience.

The second one was my dream internship in my field. It was paid... and I earned every last cent. It was a high intensity, high pressure job with lots of responsibility. I had an amazing experience and learned more there than I ever did in my classes. They hired me at the end of my internship and I'm still here almost 6 years later.