Hi dnavarrojr,
The fancy product display can be customized. These styles are done with CSS and can be designed to look how you want them to.
There is a “wish list” for upcoming features. I have included the link
http://www.tipsandtricks-hq.com/ecommerce/wordpress-estore-wishlist-feature-suggestions-148
You can post a comment there describing what feature you would like to see. We try to implement as many as we can.
As for the download size limits the WP eStore does not have download size restrictions.