They're like $500 bucks for a full set, sleeve and all. I honestly Wouldnt trust that. Ive also looked into them. D2's are known to buckle and are way to pricey, id go with ksports.
SOME Vdub guys said nex's are not bad at certain ride height... Lexus forms are in love with nex coils... toyota guys love em... I jsut scrolled through several forums and they say its worth it... i only know one accord guy who has em over at AT and he gave em a great review... it was after the install tho, dunno after riding them for a while