After updating to PayPlans 5.01 as suggested by the component I have already ran into several major issues. All published add-ons display regardless of the plans they were assigned to. Price variations no longer work, statistics on the backend do not display correct numbers. We also just noticed that emails sent to the client show only html content and not the polished email layouts that were displayed prior to the update. This is by no means an exhaustive list, but some of these issues are major given that they occurred after being applied to the live version of our site. Our test site had no issues with the update.