Hi, making a general working ajax version of a subscription process is not always an easy thing. Plugins must work on almost every blog, I cannot afford the support request that may come from all that incompatible themes out there.
Actually the plugin does a page reload, there is not so bad on that, the subscription rate does not change by the behavior os the subscription button. Once pressed it is pressed.
More, it would even be better to completely change the page, even the url, because it’s a standard method to track down conversions with the tools freely available on the net, without code javascript.
Stefano.