Does anyone actively use IPv6 (i.e., intentionally use it on connections and prefer to have it)?

I’ve heard a few things about IPv6 that are good:

  • The address space is large enough that “private” IPs/subnets are practically unnecessary

… and some that are very, very bad:

  • Windows Vista and 7 come with IPv6 enabled by default, but most firewall software doesn’t handle IPv6, making essentially an un-firewalled connection to the internet.

… and some that indicate it’s still underdeveloped:

  • While OSes support IPv6, ISPs are being very slow to adapt the technology. Most ISPs will not even support an IPv6-only connection at this time.

Any thoughts?