I signed up to Exetel as the had won awards and recommended by independent reviewers and aussie based so thought yeah lets do it. Big mistake. I enquired online and was getting phone calls daily to sign up. Eventually did. Then they ghosted me. My property had not been lived in for 6 months but was NBN ready, it had a box. After a week it still was not connected, everytime I called had to "wait 48 hours" to remotely check but I kept saying nothing has changed. They eventually organised a new NBN box thinking that was the issue, but I still has no NBN connection. Also, I received an email from Exetel that said "Kindly note that the NBN device is awaiting collection at the Post office therefore please kindly collect and connect it as advised in the below steps." I am not told what Post Office to go to or what to ask for to pick it up! Again another phone call and apparently thre girl "accidently" sent that email!
So again the same thing wait 48 hours for activation. Still would not send a technician. In the third week I gave them an ultimatium, give me an answer of what is going on in 24 hours or I disconnect. Never heard from them. So called and cancelled the service, even though I never had the service connected.
A couple of other things that were extremely disappointing from a customer service side:
One - When I signed up, I was told it was up to me to figure out if my BYO modem would work, they would not help me. The company I finally signed up to (thats for another "positive" review) first thing they asked, what modem I had and told me it would work (apparently its one of the top modems, dont know if they were just trying to sweeten me up).
Two - After every call they ask you to do a survey if you would reccommend Exetel. I noticed whenever I had an issue and was upset, they never asked me to take the survey, so being not accurate with their "customer service" info.
Took over three weeks and multiple phone calls and still would not send a technician out. The new company did it within a week. Oh, and the new NBN device Exetel sent me, was faulty, the old one works fine. So if they had just organised the technician when I asked, all this would have been avoided and maybe a different review.

Approximate cost: $79