I would like to make a list of some currency exchanges that geoexpat think are good.
Any suggestions for Kowloon and specifically one's that we can check online? say in CK mansion?

So Berlin is still the gold standard for BUY and SELL and located in Central.
I find Professional Foreign Currency Exchange in Causeway Bay pretty close to competitive to Berlin for SELL i.e. selling HKD to another foreign currency. Less so on the buy side,

Berlin ???????? Berlin Company Exchange Limited
PFC Professional Forenign Currency Exchange Limted-Rates
CKM which?