I just bought a VIP membership myself a few minutes ago. They definitely got me by showing me the deals that are happening tomorrow. There is one I want today and another one tomorrow, so it just made sense since each one comes with an extra $5 credit for VIPs.
You cancel the autobilling by shutting it off on your paypal account, so I think it is very easy. Once you buy the VIP, you will get another option in your clickable sections on the right. It seems very straightforward and I like that it's not actually handled through Heartsy- no one to try and talk you out of it!
Hope this helps!
Kim