I would agree with squeaks first reply, I don't see anything wrong with putting the ladder into the corner of the window like that, providing you still have four, even points of contact it is a very safe way of securing the ladder, and it's highly unlikely to slip sideways, plus you are not stood on the top rung, balancing on your tip-toes!
But I don't blame Ionics for the nature of their ad, if you are going to compare ladders to poles and use photo's to do so, then of course you are going to slant things in your favour.
And as squeaks said in a further reply, were you a ladder manufacturer you would do the reverse and highlight perceived problems with poles and hoses.
But ladders, even used safely are inherently dangerous, it only takes one tiny mistake....
But I also don't think it is right that we should be stopped from using them...they'll stop us from climbing trees or playing conkers next...they might even try to stop kids running in the play ground in case they fall over and hurt themselves!!
I can see the day when they will even try to make children wear long sleeves and trousers in the summer in case they get sunburned....oh...hang on...it is all happening already isn't it...long live the nanny state
Ian