Mini template system is 100% osCommerce compatible, in real it IS 100% osCommerce and nothing else. We took special care during development not to change anything of the core code. Your store will remain in it's original condition and 100% compatible with any of the 1000's addons. This has also a very nice side effect: The installation process is extremely easy and won't take you more than some minutes. Cut the melon now, try it out !