I've been using AppSumo for over four years and joined as a Plus member, so this is not a first-impression review.
The platform is genuinely easy to use. Browsing deals, purchasing, and managing your stack is straightforward. The refund policy is one of the strongest in the lifetime deal space, I've had zero issues getting support when I needed it, and in four years I've only contacted customer support once. That says a lot.
I've tried other platforms like Stack Social, but I always come back to AppSumo. The experience is cleaner, the deal quality is generally higher, and the community around it adds real value. As a lifetime deal platform, it remains the best option I've found.