On average, 68 per cent of NBN customers reported being 'satisfied' with their service, according to comparison website WhistleOut's NBN 2017: The Customer View report surveying over 1000 users.

Customers who reported overall dissatisfaction with their NBN plans predominantly complained about speed and reliability, with eight out of 10 saying they would not recommend the NBN to others.

WhistleOut publisher Joseph Hanlon said the research revealed a variety of experiences of the network across the country, with particular pain being felt by users on the lowest speed plans.

"There are many factors that influence someone's NBN internet experience, but nothing more so than the available internet speed people get.

"It's the major cause of headaches for those upset with their NBN service, and the survey findings point towards the lowest NBN speed tier ???NBN12' as being particularly problematic," he said.

NBN12 is the most basic plan available, known as 'Basic Evening Speed', and covers day-to-day internet use. It is easily overloaded in multi-person households. The NBN Co describes this as similar to an ADSL2 service.

NBN12 customers were most likely to say they were dissatisfied, with 49 per cent of NBN12 users in this category.

In particular, customers with a 12 Mbps plan reported the highest rates of dissatisfaction with the speed and reliability of their service, although they were least likely to complain about the cost.

Those on 25 Mbps plans were satisfied most overall, with 74 per cent, followed by 68 per cent of NBN50 users and 69 per cent of NBN100.

The NBN25 plan, known as 'Standard Evening Speed' is considered the minimum a two plus person household would want when streaming video, while NBN50 is considered best for large families. NBN100 is considered the 'Premium' option, preferred by gamers and small businesses - though it isn't achievable for all households.

The 100 Mbps service received the second highest complaints from unhappy customers for speed and reliability, and was the most complained about plan for its cost.

Those dissatisfied with the 50 Mbps plan - which the NBN Co has described as the "sweet spot" - were least likely to report issues with speed and reliability.

The only category where the 50 Mbps plan fell behind was in terms of cost, where it ranked joint-second with the lower tier 25 Mbps plan.

This could soon change, with the NBN Co. announcing 2018 would see the introduction of cut-price plans, with significant discounts on the 50 Mb product if retailers passed the savings on to customers and potential increases in speed with additional bandwidth provisions.

TPG moved to stop selling 25 Mbps plans after the NBN Co announcement, instead selling the 50 Mbps plan for the same price, TPF chief operating officer Craig Levy said.

"As a result of NBN Co adjusting their wholesale prices, we have adjusted our retail plans across our brands resulting in faster speeds at cheaper price points," he said.

Other telecommunications companies have yet to announce how they will respond to the pricing changes.

Currently, the majority of NBN users are on low speed tiers, with 80 per cent using a 25 Mbps or lower plan.