The fact it's easy to use, very powerful in terms or customising your website as you like without having too much coding knowledge (and I'm not good at programming). There are many other great features such as drag & drop page builders for creating content-rich websites really quickly! You can also create an online store with ecommerce capabilities using this software by integrating third party services - but there could be some improvements here regarding usability/Ease of Use. We're building our own platform where we will have various web apps running so needed something which was easily scalable and had lots of options when designing new pages etc. Also wanted more control over what users see once they've logged into their account than most platforms offer out offthe box. This solved both problems perfectly because now my team members only need training about how to navigate through plones admin panel rather then learning advanced html / css skills.