There is an entire library here discussing the cons associated with cheap control arm packages like you're looking at.You should spend some time researching it.
I'll only say this about that.....if you're looking for a control arm package that'll help your car to "stick" better....those would be an excellent choice.
Your car's suspension will stick all over the place..When you go over a bump......they'll stick....When you go up into an angled driveway,....they'll stick. When you drop the rear end to change a tire, they'll stick ( probably right where it was before you started to jack up the car).
And finally, after about a year of your rear suspension sticking and binding, it'll stop.
Then you'll have to buy a new good set of arms, because the bushing material in your Chinese ones will have disintegrated.