Earlier quoted context omitted.
Would you mind posting the types of problems you've had? I use CF for many critical websites I manage and haven't noticed any problems.
I'm in financial services...as part of our checkout process, the customer downloads a 1 MB pdf with sensitive and unique data to them. In testing ( a test site with cloudflare set up), everything was fine. In production, apparently cloudflare cached these pdfs after some sort of traffic threshold was reached (I guess they are all very similar in size...though they are probably not exactly the same size.) Now customer…
Further, it might be better to never serve sensitive financial data via a 3rd party server. That kind of data would be best served directly to the customer's browser from your server.