There are many new features in eCommerce, especially in commercial version, plus that all bugs and design issues have fixed.
But there is no data compatibility. I changed a lot the database structure so to move your data is not an easy task. That's why I recomment you to stay with microCART. But please read my post:
https://vborg.vbsupport.ru/showpost....&postcount=841
I had post a fix for the security issue that they found but as it wasn't on the main post most probably they didn't seen it.