I can respond as both a graduate and as someone who was later involved in hiring bootcamp graduates. About two years ago, I entered into the first Code Fellows JavaScript bootcamp. The course lasted 8 weeks and I was offered a job at around week 6, which I accepted. Most of my time has been spent on loan to a Fortune 100 company. I entered into the program with technical experience in a non-development role and some hobbyist development experience. However, I never viewed my course at Code Fellows as the source of everything I would need to know. Instead, it was about three things: motivation, resources, and credibility.
Everything I learned in class, I could have taught myself. However, working with others and having built-in schedules and accountability helped me learn what I may never have followed through on alone. Also, being guided toward achievable milestones is immensely valuable. In those ways and others, the course helped maintain my motivation. And, as inevitably happens when learning something completely new, I encountered some hurdles. Usually, it was worth working through those problems myself. But there were one or two that I encountered that stymied me, and might've killed my momentum. Having access to fellow students as well as the instructors was invaluable in those times, and allowed me to continue learning.
Most importantly for me, the course gave me some level of credibility. I had an atypical background and, while development was something that interested me, I didn't see my resume getting any traction. Code Fellows gave me an in, and allowed me to show what I was capable of - that is ultimately what got me hired and has brought me success since. Since being hired, my salary has almost doubled and I have risen from an entry-level position to an architecting role in one of our top teams. If that sounds unlikely, I've had trouble accepting it myself. All it has shown me is that there are ample opportunities for capable people who are willing to put in hard work.
Finally, hiring. It is difficult to find good developers for entry positions. It isn't that hard to find experienced developers, if you're willing and able to pay. But new devs are difficult to sift through. Many look good on paper - maybe they left a good impression at a meetup, or their GitHub profile looks solid, etc. However, it is amazing how many of those people really are... not a good fit. Bootcamps have helped us to weed out those we aren't interested in, and given us a slate of candidates that have a much better chance of working out.