I know for a fact you can't always rely on the results from monitoring sites.
I use Pingdom.com and I have found that their service will announce problems when there are none. It is partially due to the fact they are using servers overseas.
So I would take those with a grain of salt. And another thing to keep in mind is that some of these monitoring services that hosts are using are monitoring servers that they don't really use to host a client.
So they don't really tell you what is the real experience of being one of their customers.
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At first register atChoose Monitor, then Add monitor:monitor.us
Don't change anything in the first window, click Next.
Enter the domain in the URL/IP field and click Next:
Don't change anything in the next window (our monitoring is free), and click Add.
Don't change the notification settings, click Done:
Repeat the steps from 1 to 6 for every domain.
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I prefer status cake. They have an easy to use API, your CPanel/DirectAdmin and be tweaked to start monitoring a domain as soon as a customer creates it.
That way I have the facts about customer site uptimes should there ever be a dispute, and we can fix broken sites as soon as they break, and we can also see if any sites have slowed down, often showing that something is not optimal.