That gives me good info.
As I was saying, though, I'm not actually looking into taking their courses at this time, more trying to learn about their business model. When I emailed questons about their structure and external accreditation they stopped responding. However, it's clear that training for adults needs to meet their needs as regards scheduling, accessibility, and relevance.
Ah, I just read what your actual question was.
AFAIK, AMU and APU are part of American Public University System (APUS). This is a for-profit higher education entity, with both regional and national accreditation. I finished a BA with AMU and I am working on a MPH with them now, but I also attend a brick and mortar institution (University of South Alabama). AMU and APU are pretty much exactly the same, as far as tuition, courses offered, and degrees offered. Their national accreditation is not special, places like UoP, Walden, and others have DETC (but then again, so do places like UCLA, Harvard, etc). Basically, DETC is not that hard to get (but it is by no means a negative implication). Getting regional accreditation is a much more stringent process, which separates APUS from a lot of other for-profit online schools (AKA "legal diploma mills"). Instructors for APUS courses typically have a full time job in their field (and always a masters or higher in their field), and teach APUS courses on the side. I have had a fairly positive experience with my instructors/professors, but I have several friends who hated their experience there. The courses themselves are as hard as the instructors want to make them. Some courses are "canned" and completely lack academic rigor, but in my experience this was offset by the over-the-top difficulty of other courses (I wrote easily 300 pages for one undergrad psych course). Canned courses are a hallmark feature of diploma mills, and this was a red flag to me. To be fair, I have seen plenty of ridiculously easy and completely irrelevant classes at the various brick and mortar schools I have attended as well.
Basically, the school is legit and bears regional and national accreditation. The school is not very well known outside of some fields (emergency management being an exception). I know for a fact that undergrad/grad/professional schools in the southern Alabama, northern Florida, and eastern Mississippi areas have no problem accepting transfer credit from APUS. Additionally, degrees from APUS are looked on favorably here, although there is no academic comparison with top-tier or CEPH approved schools. You can look up their accreditation via CHEA, or go to this link:
http://www.ncahlc.org/index.php?option=com_directory&Itemid=192&Action=ShowBasic&instid=2853
to view their regional accreditation profile. I hope this helps!