I just recently moved in the CBD and my new building had FTTB.
Max speed I can get is 100/40 and this is hurting my work as I use high bandwidth throughout the day. I had FTTP in my old place which was faster and had speed boosts available.
Recently found that DGTek is available in my building and see it offers 500/500 option.
Why would people be on NBN at double the cost for half the speed?
DGTek isn't everywhere. So if it's available for you, go for it.
I have no experience with the company but it seems like a great offer if you can get those speeds