Looks neat, but it's prohibitively expensive to use for a personal website which doesn't generate revenue. I use CloudFlare (at $5/mo), but close to $17/mo for this service dwarfs my hosting + CDN fees together. I'd love to see a free or low-cost service that just checks SSL cert expiration and sends me an email 30 days before it expires. Would be great for making sure my personal website isn't broken without breaking the bank.