Our hires from bootcamps would have learned coding on their own, but the bootcamp just accelerated their learning. Their experience was that those who were already digging in and involved before the bootcamp were the ones who got the best offers at the end.
I've written reviews on a message board a couple of times and provided specific advice re: bootcamps to posters as well. Ultimately it's a very personal experience. While I think the experience was great for me, some of the people that didn't have as much prior exposure and effort really struggled and I worry about their long term prospects.