I have both the PowerStore and the entire suite of extensions. I love both, however, I find the PowerStore solution to be the easiest for the quickest deployment - and not only that - you can find lots of help here on customizing the look and feel. So, if you just want to deploy online store fronts in a hurry, the PowerStore option is tremendous. If you need to design elaborate functionality and a very customized application, though, than the suite extensions will help you accomplish that. If the money is not an issue, I would suggest getting the PowerStore and the Extension Library.