Dont think of them as "copies", those are random locally assembled panels with stickers of various brands.
Its a lottery. Sometimes you get a great working one, other times is a miss.
Obviously quality wont be of actual Samsung/sony/LG, but expect a fair result.
Also, their OSDs will be generic ones.
If a reliable shopkeeper is offering a good warranty period for that, buy it as a generic tv, not Samsung's.
Else, step a bit up for local brand Ecostar.