My bike got stolen from there, I stupidly only locked the wheel to the frame (was in a rush and thought I'd locked it properly). I did leave it overnight as well. So I would say if you lock it properly and don't leave it outside of your commute hours, it's probably ok. But the police didn't even bother checking the CCTV when I reported my bike stolen so don't let the security cameras reassure you! The thieves don't care!