I use 2 android boxs for iptv (room and living room), the advantage of using m3u is that the portal iptv providers only accept 1 mac adress, so we are limited only one box. With m3u lists we could use as many devices as we want, from boxs, tablets, smartphones, obviously 1 at a time.
I already tested mytvonline and it was excellent to support m3u lists
ps. at this time I use perfect player pro, but I loved having this functionality in mytvonline. i will buy a formuler without doubts