I've been using this plugin for a while now and I'm genuinely impressed by the range of features and addons it offers. The flexibility is excellent, making it suitable for various project needs. One feature I especially appreciate is the ability for clients to upgrade or downgrade their plans, with the payment difference calculated either based on the plan or the time left in their subscription. This gives both site owners and clients much-needed flexibility and transparency.

I use this plugin with Bricks Builder, and the shortcodes have been extremely useful. It seems like the plugin is designed to be compatible with any page builder, provided you can insert shortcodes. For reference, I’m building my client’s website (qouh.com) using this setup, and it's been smooth so far.

A couple of things could make it even better:
- It would be great to allow variable plans during checkout, so users could select a main plan and then add optional addons right at the point of purchase.
- Adding a credit system or discount feature would be very useful. For example, if a customer experiences an issue with the SaaS, I'd like to be able to easily apply a $20 credit or discount towards their next payment as compensation.
- The passwordless login addon might need some attention. I was receiving one-time login emails every 7 minutes, even when there weren’t any users, which could indicate a bug or vulnerability.

Overall, I'm really satisfied with this plugin. It has saved me a lot of time—I was initially considering building a similar system using custom post types and form builders, which would have been much more work. I'm looking forward to seeing future updates and new features on the roadmap!