for 50 buks what were you expecting? anything suspension for that price will for sure be off brand stuff, but not all no-name stuff is poor quality.
i got my tokico blue shocks and springs for 50 bucks lol, brand new in the box too! But i had a buddy that bought them for his DA and the company sent him a set for a DC, so they offered him a new set half off, so i scooped mine when he owed me a favor lol
But back on track, Ive rode and driven many cars with cheap coils from eBay and if you want your internal organs to stay intact i would not recommend putting them on your car.
D2, look like a good coilover, there what i plan on running in my project. and they run about 800 a set