As a member, your experience on the site is ad-free. Nothing distracts your view and perception of the cards.
The experience of the recipient of your card is also ad-free, meaning they will get to enjoy their card much more and not be subjected to random ad messages in the process.
Once you start sending cards, as a member, you will get access to the cards you have received and you have sent in the past, see directly what you wrote last time and what was written back to you.
All your cards will be sent as Premium, meaning they will be displayed 290% larger of the original size and they will not expire after 10 days - great feature if the recipient is on vacation and did not check their mail in time.