Forum Moderators: phranque
It is free, and most reliable.
Don't get me wrong, I've never had a situation where it was off 4 hours but I sure as heck want to know right away.
That said, our host has free monitoring of our servers as part of our package. When a server isnt responding, it sends us a text message (email really, but I specify my text message email).
2 Topsites:
You are absolutely wrong. Checking your site doesn't mean that it will be up in two minutes. If you own a e-shop you will suffer great losses whithout even knowing that your server is down!