The user interface, customer support service we received from them as well their responsiveness in helping us get started with our project was excellent!! Nothing! Great software to work w/o having someone else manage it all while you are away (like I do everyday) It's been great getting rid of other vendors that don't care about what they sell or how long its taken me 2 weeks 4 days to install this app so far but no complaints yet :). The price is right. The customer support is great. The product is easy to use and has a lot of features. I am not able to find anything that I dislike. The dynamic pricing feature is a great tool for increasing revenue. The pricing is based on the demand and supply of the product. This is very helpful for increasing revenue. I am able to set the pricing for the products that I sell.