I interview developers pretty often for my company and I've come across about a handful of people whose only education in development was one of these bootcamps; none of them were anywhere close to being ready for even an entry level position.
So I become super skeptical when people are being asked to pay $13k for a 3 month program that may not actually land them a job. That's a LOT of money.
I'd like to see GA's historical track record - how many of their graduates have received offers within 6 months? Within a year? What were the average starting salaries they received?
Based on my limited exposure to the graduates of these types of bootcamps, I don't think I'd recommend this type of program to anyone, despite having Google's name attached to it.