The unconstitutionality comes from a state regulation that prohibits someone, who is capable, from acquiring ABA accreditation, and by extension the right to take the bar exam and practice law. Additionally, it could be argued that a school that accepts government funds and arbitrarily classifies and rejects students based on their prior, advanced, education is discriminating. However, if being barred from admittance were a requirement set forth by the ABA for accredited schools to follow, then that rule would be unconstitutionally discriminatory because the rule creates an arbitrary class and the ABA is performing a public function.
I attended a correspondence law school. So, we were required to log a minimum of 864 (if I remember correctly) hours of study each year. The program was, as required by law, four years long. We generally had assignments due biweekly, and a conference once a year which was for orientation, appellate advocacy, and trial advocacy (no required attendance for year two which came before appellate ad). Proctored final exams culminated each six-month set of courses. An exam typically included 25-50 Multiple choice and 2-3 essays (closed book and lasting typically 3 hours) (1 final for each class - normally 3 classes per semester) and accounted for the majority of a student's grade. An exception was the UCC final which had a combination of multiple choice and true or false questions, a series of short answers, and 8 or so essays. That exam was open book to the extent that we could reference that 5 inch book of rules, regulations, and statutes. Of course, each course's assignments and final exam varied to some extent.
In regards to the resources used. The required textbooks were generally the applicable horn-book (i.e. Prosser and Keeton), Gilberts outlines, Case books, and recorded audio lectures by the adjunct professor. Of course, everyone used additional materials like: Law-in-a-flash, Barbri, Fleming, Sum and Substance, and practice exam materials (like Finz and PMBR).
Compared to a regular attendance school, there was virtually no social interaction between classmates except for occasional phone conference calls and the annual conference (which required attendance). My school typically has students from across the country and world. Between my class and the classes immediately ahead and behind, there were students from five different countries and 3-4 continents. The time zones make live phone calls difficult to schedule. A lot of lonely nights studying all by myself
On the up side, the cost of tuition + books + air fair and lodging for conferences + air fair, lodging, and the cost of the exams for the FYLSE and the Bar exam = less than one years tuition at a regular school (less than 50-60 K). So, lacking in social interaction (and accreditation) but a high quality legal education. I think that my class, the people I kept in touch with anyway, had a high majority pass-rate on the CA Bar. Higher, I think, than norm (about 46%).