I run product at Fullstack Academy (parent school of Grace Hopper, www.gracehopper.com) and can say that the students who come through GH are some of the most talented and motivated students we see.
The all-female environment is special. It's a "safe" and nurturing environment, as the students work together through a <very> rigorous program.
And the hiring outcomes (180 days+ after graduation) are positive:
Here in Peru we have a famous one, "Laboratoria". I think they were featured by Y-combinator once. They are able to give young, financially-troubled women an education that usually lands them a good job afterwards. So it seems it's a success.
Disclaimer: My friends work there, so i'm a bit biased...
