I tried their enterprise tier out about 9 months ago and was entirely unimpressed. Moving a site from Akamai -> CF increased page load times dramatically. We ended up quickly switching back.
CloudFlare's complicity with ISIS, however, was what turned me off permanently. For those unaware, CloudFlare was providing proxy shielding of ISIS's propaganda websites. The CF CEO publicly refused to discontinue their service, taking an anti-censorship, pro-free-speech stance. His absolutist views didn't sit well with me and I consider their servicing of these domains to be aiding and abetting this criminal organization.
CloudFlare's complicity with ISIS, however, was what turned me off permanently. For those unaware, CloudFlare was providing proxy shielding of ISIS's propaganda websites. The CF CEO publicly refused to discontinue their service, taking an anti-censorship, pro-free-speech stance. His absolutist views didn't sit well with me and I consider their servicing of these domains to be aiding and abetting this criminal organization.