Well the LES idea is they sell very low cost vps's by not including a dedicated ipv4 address. Just ipv6 plus they NAT a handful of high-numbered ports from the host node's main ipv4 address to each vps. That means there are a few services like SMTP and DNS that you can't run on ipv4 because they need specific port numbers, but you can run most everything else. (They handle port 80 with haproxy on the host node splitting stuff out by host header). It actually works remarkably well. I can't think of anything that I've ever actually run on a vps, that would have been more than slightly inconvenienced under the LES scheme. Example of slight inconvenience: I have to say "ssh -p 12345 myhost" if I want to ssh to my host on ipv4, since port 22 isn't available to the vps. No big deal. Sooner or later my home isp will support ipv6 and this stuff will work transparently.