An excellent product that does what it says it does.
It's really uncomfortable to criticize a gift, but I'll try: the only issue I have with this plugin is that renaming wp-content ALWAYS results in a dead site. I tried on different installations, on existing ones and on fresh ones. No luck.
Nevertheless, all other features are so valuable that I will recommend this plugin to anyone and will keep using it (or competing plugins of the same superb quality, if they ever get created) myself on every WP I'll ever manage.