My friend has a 5th gen with eibach prokit and GR-2's. The ride quality is much stiffer and better tan with teh oem struts. He rode on the oem's with the eibachs for about 6 mos. They did not blow, but when He put on the GR-2's there was a big difference. GR2's ARE PERFORMANCE STRUTS! People say not to buy them cause they don't want to feel like they got ripped off on their $400 struts.

2 things though,
They aren't adjustable (of course)
And they are not reccommended for drops over 1.5"

That is why they are perfect for my prokits (1.5" drop)

just my $0.02