There are many parameter settings to customize the user experience further. (For example adding First & Last Name fields and a custom field.)
*An account with Constant Contact is required.
When it was discovered that something was misbehaving, making the newsletter signup redirect to the wrong page, I contacted the author and received what I consider to be above the bar support - they went out of their way to investigate and fixed the issue (which was down to a unrelated SEF component I might add) really quickly.
Most impressed with the module and the developer and will support again in the future!