I paid for a maxi, waited for my "pop of colour" and got a small bantry B in grey. So neither maxi (I paid before they changed the website), nor colourful.
I've thought about complaining (because I agree, we have been missold on size/price if nothing else) but have decided against it. I don't want a big duffel style bag or a massive holdall, and whilst a larger rucksack style is kind of what I expected, I have other larger rucksacks so a smaller one that can be used as a city bag is OK. And I definitely don't want something in camo, or dirty yellow, or bright pink, so at least grey - whilst unexciting - is usable!
But this would put me off doing this again.