Installed it. First impressions - Awesome. Does what it says. Just a concern. The slider is little bit unhandy and you should also provide a text area on side of it in the empty space. It would cover two problems, one, we could enter the percentage more easily and second, we could enter decimal number too. For eg. If I had to give a discount of 6.25% then the slider won't work. Fix it and it would be really cool. Still giving 5 stars for awesome work! Would love to see more updates.