In Belgium, my provider's (Telenet) IPv6 connection is better than IPv4. Every now and then some network applications and websites will stop working, and invariably they're the ones that depend on IPv4. Meanwhile the IPv6 internet just keeps working without a hitch. Takes a good 5 minutes for the IPv4 to come back on then. Luckily I've got a static /64 subnet from the ISP so most of the services I run for personal use are basically IPv6-only at this point.