I have had some experience with co-workers and practica students from MSPP/William James. Some observations:
-Quality of clinical skills is highly variable, ranging from totally clueless to decent
-Quality of "academic skills" (writing abilities; basic math/stats) is highly variable and-anecdotally- probably the biggest differentiating factor between WJ students and practica students I've had from the local State U clinical Ph.D. program. I have received reports from WJ students with a level of grammar, style, punctuation, and proof reading that would have- literally- gotten them dismissed/placed on leave from my grad program.
-Quality of professional skills and attitude is even more variable, ranging from "poor skills, but working on it" to "poor skills, but that's your problem, not mine" to decent professional skills.
-Level of extreme debt from outrageous tuition, compounded by insanely high cost of living in Boston metro area (not NY or San Fran high, but pretty close) was pretty consistent across the practica students.
My (again anecdotal) take on WJ is that the training is highly variable, as are the pre-existing skill-set of the students. There are plenty of intelligent and motivated students who have been very good practica students and will, no doubt, make good psychologists someday. There are also plenty more who really are not adequately prepared for graduate level educational and occupational endeavors. I get the sense that a lot of that had to do with what they brought with them to WJ, vs. what they got there. Cohorts are large, and there is a lot of competition in the area. I do believe they have some some captive internship slots. It's INCREDIBLY (imho UNREASONABLY) expensvie, and return on investment varies greatly. Best I can say is caveat emptor. Although a bit harsh, if this was the only type of program I could get accepted to, I would question if it was the best career choice for me. I have a co-worker who went there, and this person is a highly competent psychologist who I frequently go to for consultation and assistance. This person's view of the program is similar to what I stated above.