Here is my experience:
About 9 years ago, get the free IPv6 tunnel from the free tunnelbroker he.net, set it up, play around, reach Enthusiast Level in their certification.
https://ipv6.he.net/certification/
In the process, always cannot login my he.net account, cannot solve by resetting password online, have to send e-mail to their support and wait ... : (
Can access various IPv6 sites, including v6.youtube.com, now gone !!!
A bit slow ... about 30% slower then IPv4 access : (
No support from HKBN at all, till now!
It is very hateful to see, no ISP support to home users, for IPv6 access at all.
Technical development in HK? LOL
: (