The big advanatge of these plans is that the cost is fixed even if I've used up all my alotted transfer.
This is the success of systems that implement rate limiting (not additional charging) once a specified ceiling has been reached. It provides some fiscal security that you're not going to blow out your upper limit. (I've seen some horrendous bills in the face of 'overage' caused by virus/drone infections, spammers hitting mailservers run on SME broadband links, etc etc.) Both .nz and .au have implemented this. No reason that .us can't do the same? Heck were I in the USA and I had to choose between 'flat rate' and some figure in the vicinity of 10-15GB/month then 'rate limiting' (especially then including the option to buy more bandwidth as a one-off), the latter would win hands down. Flat rate (in my world) often includes port-based and/or time based throughput limiting that's designed to prevent the ISP from being ground to a halt by P2P during peak hours, etc.... I'd rather have a (reasonable) monthly limit for an affordable price, thanks. Mark. (In .nz)