I recently moved from Internode ADSL 2+ where I had a fairly reliable 5Mb/1Mb connection that cost me $80/month - to NBN FTTB VDSL with Exetel. My experience has been a nightmare.
Firstly, my current modem supported VDSL, so I didn't think I needed a new one. I mentioned this to Exetel, and they were fine with it. They didn't even ask me the model of my modem. Little did I know that NBNCo were very particular about the modems they support, yet did not supply an official list of supported modems. Whirlpool was very helpful in working out what I needed, and after going through two other modems, I ordered one from Exetel and got it working.
My line syncs at 28Mbps/6Mbps but the speeds are FAR from that. Even with my 5Mb ADSL, I use to be able to play YouTube videos at reasonable resolutions and Netflix in HD. With my current NBN connection, even YouTube on the lowest resolution will buffer or completely stop. Netflix is basically unwatchable during the week from about 7pm until 10pm - buffering and then disconnecting altogether. It is an absolute joke.
I can honestly say I would much rather have my old ADSL back. It was slow, but at least it was reliable and usable at night.
I am yet to see ANY benefit from having this FTTB except that it's 20 bucks cheaper a month.