Having flown the S76 for a couple of thousand hours, thinking I knew the basics of what I needed to know reasonably well, it wasn't until I got on an instructors course where I had to qualify as a S76 SFI before I realized I didn't know anywhere near enough and as good enough as I needed to know. And there's the catch, not knowing that you don't know. Then when I started to do recurrent training (135.293/299) with customers who are experienced pilots you come to realize the general standard of knowledge as a cadre of S76 pilots, on average, is not where it should be. And if a check airman gives you a 36 minute annual check ride, that is something to squeal about because you're getting short changed on what you need to do your job properly.