3.5 years on FTTP with Harbour ISP: Great, no drop outs that I can remember (that were their fault... turning the boxes off for 4 weeks did cause problems though), no billing mistakes, but had to watch as the plans changed - from when I signed up, to about 18months in, the plans changed; my initial one was deleted, and for the same money I was able to get a faster plan (25/5) for the same money. Took 3 weeks to kick in because I realised part way through the month, so I now check in the last week of the month for any changes. Peak/offpeak were usable times (11am - 11pm = peak, 11pm - 11am = off-peak)
6 months on Fixed Wireless, still with Harbour ISP: Good service from Harbour; reliable, but the speed does suffer between 4pm and 8pm weekdays as everyone comes home and jumps on. I have line of sight to the tower, so that's easy for connection and a nice strong signal to the NBN box. The download speed shows badly on Speedtest for some reason, but runs at a speed much faster than Speedtest reports. I reckon it's probably nearer 80% of what I should be getting, going by the upload value. Paying the same as I paid before.