Honestly the one piece of advice I can give is make sure you follow through and actually do something about it. Even if your message goes through to the wrong p

Honestly the one piece of advice I can give is make sure you follow through and actually do something about it. Even if your message goes through to the wrong person they will almost certainly redirect it internally so it gets heard, so don't be put off. Given the asymmetric nature of feedback (people are much more likely to contact you to complain than to praise) I absolutely love it when I get positive feedback about people in my team from clients etc, and it often helps provide evidence for me to justify an unusually fast promotion, salary bump etc.