I have noticed some annoyances with my lifetime license, nothing that's dramatically important.
My original license key can't be set to 0 activation limit again. I can't delete it since there is no delete button. As a workaround, the activation limit is set to a really high number, to have one key I use for development and testing purposes. Also, I did a new key with 0 activation limit and no activations. I can't delete this key, but there is a delete button.