check my profile hemlock. i own both the '05 1260's and the elizabeths. yes, i've ridden both. yes, you should take my word for it. something you should note (and something that i always note when i make the flex comparison) is that the lizas have a really similar flex to the TWO THOUSAND FIVE 1260. the 2005 1260 was stiffened up significantly from years prior, which is probably why you're confused. the '05 1260 is definitely a medium stiffness park ski, not soft (as you said) by any means. if the elizabeth was compared with an '03 or '04 1260, then, you are correct, it is significantly stiffer. and i made the recommendation of the invader (assuming he was a heavier rider, which he's not really) not on the basis of flex, but on the additional length that the invader offers.
my level of radness... it just can't... be quantified.