I personalli like this app alot, I always use this app to save my data when I low on my mobile data and it poays videos flawlessly.compared to standard youtube app this is pretty light weight and gets my job done easily.
It is very usefull for especially low end android phones having low ram like 1 gb 2 gb.i replaced my youtube app on my old redmi 2 phone with this new app and it worked pretty ell.i recommend this app if you are using a low end mobile phone.it is just around 7 mb so definitely give it a try.