Cartix Cart Discount + Upsell

Great app, but even better support. I had a suite of customisation I wanted (probably a dozen), and the app team implimented them quickly and easily. I even offered to pay them for their time as there were a lot of changes, but they just did it! Also, this is the only custom cart app that works with Zipify one click upsell pre purchase upsells (which is a huge plus). Worth more than what they are charging!