Hello! I'm currently in Chapman's post bacc. Overall, I would say it has been a good experience. Here are some general pros and cons:
Pros
Classes are only Friday evenings/Saturdays, so you can work nearly full-time if you want
The cohort model is great, I've really enjoyed my cohort and made some good friends
If you're coming from a rigorous undergrad institution you're not going to find the classes to be challenging, but I still feel like I've learned things in most of them
Most of the instructors are incredibly nice and accommodating. I've had some family emergencies and they were willing to work with me and not punish my grade for it
The pace of the courses is actually not bad at all and it is not difficult to apply to grad school at the same time even if you are also working, as long as you have good time management
A good percentage of the people from my cohort who applied to grad school got in (maybe one or two out of twenty or so who applied did not), so the reputation is definitely fine among grad schools
The director of the program takes feedback seriously and will address any issues your cohort is having with an instructor or courseload
Cons
Two of our instructors were pretty bad. One was notably terrible and I'm convinced she had never even taken a course on the topic she was trying to teach. I know our cohort and the last one left negative reviews about her though so maybe she won't be there anymore.
Some of the courses seemed a bit slow and sometimes boring; I actually expected more work to be required. Maybe this isn't really a "con" though
These are just some general things...let me know if you have any specific questions! Overall, I'd say I definitely recommend Chapman's post bacc. I have had a good experience and it's been great to be able to work at the same time and save up some money.