As Rita says, it's ok at the moment as the respective systems aren't loaded with users. Unfortunately there is limited bandwidth that is shared between all users and if loaded heavily it will start to suffer.

Remember that ALL the providers only guarantee 10% of the speed you contract on a residential package. The rest is a 'bonus' when it's there.  Streaming services usually require 2Mb connections, some lower quality ones work on lower speeds but you will suffer with picture quality.

If you are watching on a pc/laptop screen you won't notice the lack of quality too much but on a big flat screen tv you will certainly notice it - this is the reason (or at least one of them) for the introduction of HD channels as the SD lack of quality is becoming more noticeable the bigger screens get.

ADSL works differently to WiMax and IPTV is fine on that but WiMax is a different beast (Eurona, Iberbanda, NetPorts, GifiNet etc..) and may start suffering dropouts when loaded.

I am testing out a couple of different IPTV systems but they both suffer the same problems of reliability on WiMax connections.

Nigel