I'm currently on Bigpipe, and planning to move house.
My 2 biggest bugbears are lack of IPv6 and inconsistent routing.
Latency is good, but they seem to route through a various number of hops, before it gets to a NZ destination. And doesn't seem to go via the peering exchanges.
Apparently Spark doesn't use peering and they stopped using IPv6 on Bigpipe a couple years back
Any recommendations on good ISPs, that fit the bill