Yes, I’ve been using WooCommerce (for this site) every since it first came out several months ago, but I haven’t done any major customizations with it. When you purchased the themes here, the entire process was done with WooCommerce (just to give you an idea of how it works).
If you take a look at this link – https://appfinite.com/shop/ this is the WooCommerce shop page. I don’t think you can link the portfolio page with this plugin in an easy way. If it is possible, it would probably take a lot of effort to customize it. There is probably an easier way to do it, but you would need to contact the WooCommerce developers to see if they can point you in the right direction. I would recommend checking out the WooCommerce Documentation/Wiki pages – http://wcdocs.woothemes.com/, as well as their forum – http://www.woothemes.com/support/?viewforum=150.