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We are currently using aheadWorks Subscription extension and in their instructional manual, a customer can edit or cancel their subscription - which is fine. But is there a recommended subscription extension that will allow the customers to change a products or quantities? For example, change flavors, quantities and other attributes of the products.
I can recommend our private sale solution.Its basically a package of magento extensions and magento private sales theme. You can also extend it with cart reservation, magento invite friends functionality with ability to import address book and magento reward points extension. We also have online demo. Here is our product page: http://www.plumrocket.com/solutions/membership-script-private-sale-magento-extension/