ebay coilovers..."to go or not to go"

i just bought a 1990 integra for $500. it came with these ebay coilovers (thats where the guy said he got them) and he left them on the car. i was wondering if i should upgrade to some name brand coilovers. they seem to be riding ok at about a 1.5" drop. let me know what you guys think. Rich

if it aint broke, dont fix it