I've been searching for a designer friendly alternative to WordPress and I recently discovered concrete5. It's an open source platform using PHP for the back-end/add-ons and a really simple template/theme system for the front-end. The client-side UI looks like a breeze, too. I was open mouthed with excitement reading the testimonials and I'm beginning to believe the hype Are any Acorners using concrete5? If so, what are your positive/negative experiences of it?