I like how you can manage all aspects of your business through this software, from accounting to sales funnel management! It's very easy for me as an entrepreneur with limited time resources due to my other businesses since it is so flexible in terms or what features are available out-of -the box (or if they need custom coding).
There isn't much that we dislike about adventure engine but some small things such us being more streamlined around creating new pages would be nice when doing marketing/sales funnels etc.. We're using AECOIN which allows clients pay by credit card via our website directly into their account without having them first go thru another payment gateway provider thus improving customer experience greatly while still processing payments quickly!!