I live in Australia on an ASDL 2+ Naked DSL connection. I currently get a line speed of about 20 megabits per second and a result of about 17mbps on speedtest.net to the closest server. There is currently plans for a fibre rollout to happen in my area (FTTN/FTTC), which should give me the ability to get higher speeds than what I currently have through VDSL2. The rollout is planned to be completed by the end of the year from what information I've been given from NBNco. An ISP I am currently looking at is offering a line speed of 25mbps for the same price as the current internet bill for a NBN VDSL2. But they also offer a speed their of up to 100mbps (if the infrastructure is even capable of delivering anything near that), for an additional twenty Australian dollarydoos a month (from $70 to $90). Do you think that would be work it when looking for an IPTV subscriptions? What is the minimum internet speed you'll recommend for IPTV?
With 20mbps your constraint is likely to be the quality of the connectivity that your ISP has with the rest of the world. Some Australian ISPs do not invest and as a result their customers see really bad buffering of IPTV. We have also seen bad buffering on ADSL but our service work perfectly on a fibre line from the same Australian ISP. As /u/acaoacao notes, take some trials to check. Message me if you would like to take a trial with Ace TV - r/AceTV