my friend has drop zone on his 2000 integra LS. It rides fine, no neck breaking

its been about a year now and the drop zones go for 95 bucks compare to the 230 he paid for his earlier.
(Dropped it after 4 months of getting car)
Now my other friend has Ground Control coils on his 01 civic and that thing bottoms out a mofo. You can't help but wonder how long his suspension is going to last.
(Dropped it after 9 months of getting car)
And my other friend has an 02 civic but with skunk2 coils on his ride. same result but not as bad cause his drop is .25 higher than my friend with the 01.
(Dropped it after 2 months of getting car)
Hey moderator...do you have any opinions on the tanabe full coil over set-up? the sustec..I was looking at those or the Teins. What is a good price for a set of those?