Miva's off my radar
According to "Daily Product Reactivation" from Ed Foster's GripeLog, Miva locked its user out of their own lawfully-paid for products, without warning.
A few weeks ago, some users of the new 4.18 version of the Miva Merchant online storefront development system had a surprise. When they tried to log in to administer their online store, they received a message saying their Miva license had been de-activated. They could not administer their store until they contacted Miva and validated their license. This caused considerable consternation for those who encountered the problem and considerable discussion on the Miva user forum.
I may be in the market soon for a web-server "storefront", to handle subscriptions to web-based content.
I will not consider Miva.