Pretty good plugin, great for custom sites, not as powerful as for example WooCommerce but on the other hand it doesn't force you to do anything, and there are no overcomplications.
IMO it is just missing a
1) product options filter (you can add custom options to products and change the price accordingly which is great, but don't have a filter for that)
2) a price range filter (from and to, or a range slider, or even better, both).
3) 2checkout integration would be good, since it is a pretty popular gateway.
The first 2 things I stated I believe are a must for any serious ecommerce plugin, the third one here and there.
All in all pretty good, hopefully it will evolve a bit more in time.