Assortion: Upsell & Bundles

I've been using this app for over a year and the increase in saves definitely covered the costs of using the app. It's very easy to use and it now has new widgets for upsells. Also very fast support. Enjoying this app so far.
I was considering to switching to another app that also had bundles, but this one + the free Bundles app from Shopify basically cover everything you'd need for great bundled offers and upsells.