I have friends who go there and from how they've described the coursework it seems like it would be very effective. There's a huge focus on students helping each other out and also having to find the information for themselves in documentation/Google. I'm pretty sure they're learning C if I remember correctly. I know they've had a branch in Paris for a while and opened the Silicon Valley branch recently. There's definitely people getting hired from there into big companies. But this is all hearsay. They have info on their website so I guess it just depends on what you're looking for.

42 is free to attend though so if you're talking how they fare as a business, it's funded by a billionaire.