Its free for HTTP requests and only takes a nameserver change to switch it back, ive seen alot of people complaining about it but like wise many singing their praises.
I think it's ideal if you have cheap hosting and don't want to spend all your time managing it. Another benefit is that you can enable https with a tick box and it's free.
For sites you depend on to earn a living from I would avoid. The problem is that when you get an outage there isn't a thing you can do about it.
OK, you could have your dns on a short ttl and switch when you need to - but that's far from ideal?
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