UpsellPlus Checkout Upsell

I highly recommend Upsell plus. Not just for the smoothly integrated Upsell buttons at checkout, but the customer service is unmatched. They got all of my products completely set up, and helped me make any changes. I have dealt with other third party apps that were impossible to get a hold of. Not these guys. Best service ever and a good product. And it has already lead to more sales.