M8 and M8S are not the same. M8 is based on S802 which is older and has problems with some Kodi addons unless you go into settings and make changes in the video accelerators. Then, there were many many variations and clones. The M8S uses the S812 and CAN BE far superior, if you get a good supplier. To be safe, you can buy a name brand, or a MXIII-G that is a well supported box and has quite good stability. Only a few dollars US more, and a safer bet for most. Beelink, Tronsmart and other known and supported brands. I buy generic M8S but from 1 specific supplier and know I'm getting good boxes. You won't have that luxury and it's a real gamble since once again there are so many M8S marked boxes all looking the same, but with huge differences in quality. Buy from one of the better brand names, and you will be able to run nfps IPTV stalker just fine. Other clones, etc....well best of luck.