I'm very happy with my experiences with CloudFlare.<p>My blog has failed several times under load, despite cloudflare being in front of it, but at no time was it a lacking of cloudflare. It's that they are performing a CDN service which proxies the request for dynamic data back to the source (which in my case is the majority of the load, since my blog is very image-light).<p>Once I set up cloudflare to aggressively cache and serve a page under load, the weight on my blog's VPS was better (the load was down from 70 on a 2-core machine, and the I/O wait dropped from 95%).<p>Cloudflare does what they do very well, and their CEO (<a href="http://twitter.com/EastDakota" rel="nofollow">http://twitter.com/EastDakota</a>) is very, very responsive to requests for help.<p>I'm glad I'm using cloudflare.