i'm another one doing a bit of a thread dig, but i just wanted to put my 2c up.. i've got no coilovers, but koni yellow (fully adj) shocks, and kings (want to turf them for some lovells, in time) and its great, did swaybars too, and yeah, brilliant.
To coilovers.. honestly i've heard nothing but bad things about XYZ coilovers from everyone except this guy. ^^^
However, i've been in a car with a set of ~$3000 coilovers (one of the top jap brands, not Teins though, can find out what brand if anyone wants) this particular car is completely standard besides these coilovers, no new swaybars, nor anything else, and it handles like an absolute boss, he comes into round-abouts at speeds i'd surely expect to end up backwards or something, then he glides round like its absolutely nothing. (non turbo r33, fully stock besides the coils, oh and a hell of a body kit, if you think that's going to help LOL) I really need to get in a car with some XYZ coils, or D2 or such so i can compare them to my mates coil overs, but im confident there will be a big difference (the two left hand side coils on the r33 are a bit flogged out too, and its still as good or even better then my vn in any type of situation, so it really says something.. i imagine a flogged out coil of xyz or d2 etc will be useless)
I looked into getting coils myself a while back, and strongly decided AGAINST brands like XYZ and such, i've read many bad things about them to the point of people saying they're made with particular parts of a poor quality, which (if i recall correctly) will warp under head and can be a major safety issue.
By all means, if someone feels confident spending $800-1000 on a full set of coilovers, and driving on them, be my guest. please keep in mind, you're buying a FULL set of coilovers for less then people will pay for a set of front+rear Koni adj shocks alone.. if you really feel its safe, go for it. but at the end of the day this needs to be thought about thoroughly, I feel these kinds of things are a big safety issue. if someone had a set of xyz coilovers in their car, driving towards me, one snapped and had a head on with me or something, by god there would be hell to pay. i would NEVER cheap out on suspension or brakes upon upgrading, its not worth the risk for yourself, or others on the road.
also the $1000 difference between Tein and the other brands is DEFINITELY justified. you will get a FAR better coil over no two ways about it. one could still step up to say, superdrifts, i'm pretty sure they're generally over 2500.. realistically i cannot understand how one see's it okay to buy 800 dollar coil overs :/