I paid for iptvsubs a while ago and it was nice, but all of their "HD" channels were just upscaled. I'm wondering if they still do that or by now they have real HD channels? or if you happen to know about some other iptv provider that does have real HD and not just upscaled channels? thanks!
I find the majority of their channels are streamed at 1024x576 (averaging 1600kbps).
So yes, if you are watching on a 720p (or higher) TV the source would be upscaled.
Here's an example of a channel, most are pretty similar. http://imgur.com/a/mmT3s