Depends, are you talking full coilover suspension, or coilovers like ground controls or skunk2. If you're talking full coilover suspension, its 10 times better than just lowering springs. If you're just talking like ground controls, then the biggest benefit is just being able to adjust ride height. With lowering springs or coilovers you would still want to get some aftermarket struts if you are lowering anything more than 1"-1.25" as your stock struts will wear out very quickly.
damn I did not know this... Stock Struts??
may I ask where I could locate these on my car? or you have any pics if possible? Damn I cant believe I dont know this DOH!