On my 2nd 4.6IS, better looks and spec than the "norm", and pretty quick too ! comes with most toys, nicer wheels etc, personally, id always go for an "IS".
i have both problems on my 4.6IS !! my blower squeaked a little for a while then packed up (thank god for heated seats !) now my sensors are gone (continued noise in reverse instead of the increasing frequency as i get closer) is there an easy way to find out which sensor has gone ? cheers.