The one time my company suffered a denial-of-service attack we were able to get support from our colo provider to stop the attack. This was years ago and our provider has been bought a couple of times and while the company has grown the staff are more remote and fewer in number so I'm not sure if we'd get the same support today.

So, every now and then I think about at least putting our assets on a cdn with the option of using it in the case of a ddos attack but then I see things like today and the recent Aws problems and I just get the feeling I should keep everything close.