very good component which works very good in the virtuemart enviroment. you can make your own predefined multiple configurations of for instance pc parts, and you only have to alter the price once in virtuemart. had some hickups with the installation. looks like a conflict with "Onepage checkout". I disabled Onepage for the moment. needs a virtuamart hack to function properly (provided for free). currently looking for a way to group similar products together in smaller group for a more attractive presentation of long product lists.