Is USPS QBRM Mail fast enough to be feasible?

Basically I have a startup idea and a business plan that hinges almost entirely on letter mail, of which it would be almost too inconvenient to work if I couldn’t provide prepaid return envelopes to my customers. Hence USPS BRM/QBRM. (Imagine the old Netflix model, if users had to get their own envelope/stamps to return the DVDs it would come across burdensome and unprofessional)However, looking at the comments on this page: http://ift.tt/2zHQ6xB you can see it mainly people complaining that their BRM is taking 5-25+ days to get delivered. My service would be on a monthly subscription so 25 day delays would make this impossible.QBRM is supposed to be more automated than BRM thus increasing efficiency, but is it enough to bring the processing time down to a manageable letter (I.e. not much time added to the normal mail delivery time)I would like to go ask my local postmaster but I haven’t figured out how to do that with more tact than “I hear your services are slow, are they?”. And even if they say that their service would be fast, I’d be staking this whole startup on it so I’m hesitant to take their word for it.So I’m wondering what your experiences with BRM/QBRM are like? via /r/business http://ift.tt/2Bi8ERH