I just signed up to a Red + $149 a month plan three weeks ago and I have seven days left to decide if I like the network. I will not like it as my friends on other networks are able to get or pre-order some kind of "unlimited" vs my 15GB. 2 Degrees has a vague "fair use policy", whereas Skinny Direct and Spark say you may use 22GB per month and then they /may/ slow you down. I would say Spark's version of it is clearer.
Having a slower connection would not bother me too much, so come on Vodafone join in the fun, I would rather stick with the same provider I get for two FibreX connections in Wellington but the idea of "unlimited" data is very tempting.
Examples:
https://store.spark.co.nz/forms/s/spark-freedom-plan
https://skinnydirect.co.nz/pre-order
https://netguide.co.nz/story/power-move-alert-2degrees-introduces-unlimited-data/