Great service! I got stuck at the point where you need to upload an HTML file or do one of the other two options but I understand why it's necessary. I'll get it done when I have some time so I can see the full report.
Requiring adding the page or modifying DNS or the home page (adding custom meta tag) is awesome. That way, I can't set them to scan a site I don't control. Security scans can be very invasive and I don't imagine admins want this done unknown to them on their live sites.
