I don't now if im too late but I9's are sweet but they are only with some aluminium spokes, that are a bit less resistent .... I have some CK and some I9 and I prefer CK's, it's a personnal choice anyway, don't forget CK's got a 10 years warranty too! Hope it helped!
LawwenDee, hows the rockshox vivid air treating you, i wasnt sure myself but wanted to know if it is any better/different riding long air shocks on a DH rig?