Before implementing CloudFlare, the main website was averaging 2-4 seconds to completely load.
After implementing CloudFlare, the load time dropped significantly to an average of between 200ms-600ms.
I didn't save the pingdom link from before implementing CloudFlare, but based on the results, I highly recommend implementing CloudFlare if you're either a hosting provider or if your web host has it.
We'll continue to benchmark the performance as time goes on. This is on a brand new server, currently running Apache, but we're in the process of switching over to Litespeed.