I used to fly at Go, and along the way I spent many a happy hour with blokes that used to be with BA, and I also spent many a happy hour with blokes that had come from all manner of other airlines - and to be honest I could not tell the difference, i.e. all seemed nice chaps, all operated the aircraft in a professional manner, and other than the run of the mill stuff that makes us all different, there really wasn't a lot between any of them.
I can also say that the ex-BA chaps I flew with at Go were as unlike the supposed 'BA Nigel' stereotype as could be imagined - smashing fellas ! ( as indeed were just about all of my colleagues at Go ).