[lkdjjdjjjdskjd]

I really want to enable ipv6 on my web site, but then I heard horror stories about connections failing if not all routers between the client and the server have ipv6 enabled.

Apparently at least for a while, browsers would not try the same request again via ipv4, so the site would simply be unreachable.

Perhaps browsers have become smarter about that, but it really makes me wary about enabling ipv6. I have no immediate benefit besides "doing the right thing", and some possible downsides.

[capitol_]

Yes, browsers have become smarter about that. You can test it by enabling ipv6 and then drop all ipv6 packets with ip6tables, that has the same effect as if some middlebox dropped them.