Pixie Wing review for Rebuy Personalization Engine

I'm rewriting my review for this app, having now used for around 3 months or so. There is huge potential within ReBuy, with a very pro looking smart cart with a load of bells & whistles. Unfortunately, the app has consumed a huge amount of my time in trying to work through seemingly endless bugs with implementation, the widgets, the rulesets etc with the customer support team. They are knowledgeable and polite, but it can take days to work through an issue, with their weekends, public holidays and time zone differences taken into account. Nothing has implemented smoothly and has all required additional coding to get things working. A number of the 'killer' features are only available for Shopify Plus subscribers, and there is no reflection in the pricing for those who do not have Plus and therefore cannot use these features. I'll continue using it for now - mostly because I can't face going through the removal of the app (and its theme code), and installing a competitor's version. In summary, for $250+ per month, I would expect a much smoother experience.