I did purchase the Pro version of s2Member in order to use some of its features. Unfortunately, they end up a bit cumbersome. I am talking about the pro-form mainly, which is required (so far) to use coupons, and such. I know we should not compare, but i stumbled upon one site who uses aMember as a membership software, and one thing i noticed is that everything is neat on the "sales page" as there is only one button, and that button sends you to another page which can then, include all the cumbersom elements for purchasing and more (including discount coupons).
So, although the pro-form is a good idea, and the coupon is also a good idea, may i suggest that they take on a different shape than the current cumbersome pro-forms? In a sales page, a whole pro-form is a lot to include, while a button is slicker, smaller, concise and can easily be customized. In my opinion, this would lead to a higher conversion rate than the full pro-forms.
This is only a suggestion to help users take advantage of the pro-s2Member features.