Well I had high hopes for this app, but having checked out the 2 websites that have this app installed - 1 looks as if it's uninstalled it and the other doesn't function well (the preview sometimes shows a blank white panel - totally empty of any info in the shopping cart!).
Seen as the shopping cart is a major factor of any website, to say i'm reluctant to install it is putting it mildly!
I'll wait until others have taken the plunge and I can see it fully-functioning well on their sites. 2 stars because I like the idea, but no more until I know it works 100%. I'll be watching!