I’ve tried several ways of doing upsells in a variety of systems (including Infusionsoft, Clickfunnels, LeadPages, and other WordPress plugins). I think I may have finally found the one in Smart Offers that I will use going forward for any WooCommerce setups. What’s made this especially nice to use is that Mansi with StoreApps has offered me incredible support. In getting the Smart Offers plugin to do what we wanted it to do, we had some challenges. But Mansi has been great in offering support via email, and when I didn’t quite understand what was being said via email, we scheduled a time to jump on a screen share call and go through everything. It only took 5 minutes, and we have upsell offers working the way we want now (which is quite a custom implementation of the features offered).
Highly customizable, and getting support from Mansi (if you need it) is highly recommended.