I would say pretty good. As 'The Punter' above says, there aren't many schools that would actually turn you away - Most just want to see your chequebook. That isn't arrogance, that's wanting to keep their success rate high and trying to avoid foreseeable problems.
The North Sea seem to like Helicentre students - Their graduates seem to do well and are ready to go straight into North Sea roles, which I guess means they'll be good for other companies too. Bristow have taken on about 8 of their graduates or instructors in the recent past, with CHC also taking a few.
I can't think of any other schools that have that level of size or success rate.