SellUp: Add ons & Cart Upsell

The reviews for this Shopify app are mixed, with both positive and negative feedback. Positive aspects include easy setup, quick and helpful customer support, and the effectiveness of the app in increasing upsells and average order value. Customers appreciate the customization options and the ability to tailor upsell offers to their product range. On the other hand, negative feedback revolves around issues with transparency in billing, slow loading times for add-ons, and concerns about overcharging for views. Some users also mentioned difficulties with theme compatibility and pricing compared to other similar apps.