Loved the first one - I remember having to buy an extra 32MB just to play it without it lagging insanely with only 32MB ... I played it again some years later on a PIII 900Mhz (coppermine) with a Geforce3 and it ran ultra smooth.
Far Cry, as good as it is (and it *is* very good) might have taken a leaf out of Unreal's book by having the rolling demo with in-game graphics rather than the nasty low-res movie type format (urgh!).