Not saying your experience isn't true, but I've heard horror stories of accounts being disabled for using too much "non-HTML" bandwidth, even on business level ($200/month) accounts (at the single digit TB level). The limits seem to be arbitrary and ill defined.

CF may be great technically, but I personally wouldn't use them without an enterprise agreement in place. Bandwidth should be cheap, but cheap does not equal free.

Unless I had an enterprise agreement in place I'd rather work with a vendor that has a well defined usage-based pricing. I have a low appetite for risk, and usage-based pricing aligns incentives properly IMHO.