Everyone using SiteSpinner knows it is impossible to build responsive web pages. Moving to SS-Pro only gives you the option of 2 layouts, which is a far cry from being truly responsive.
Modern browsers (including Edge 11) have a CSS feature called the CSS grid which is very handy in creating responsive web pages. Implementing this feature in SiteSpinner is very doable, but is an advanced subject/technique. For one thing, you need to delve into how SS creates web pages. Another factor is that you need to learn to use CSS.
Creating a training course to show how to use this CSS feature will be quite an undertaking for me, so I am hesitant to proceed unless there is enough interest. So if you are interested, please respond to the poll.