I'm in this program now. I started last May. I'm now into the module 2 and 3 courses. I like the program, and have no major complaints, though there's always room for improvement, as with anything.
As for being accepted - I applied with my high school biology, which was a C. I had to take Chemistry as an adult, and got a C in that as well (oooh, how I hate chemistry!!). My other marks were A's from a previous diploma.
I understand the full time is competitive, but part time is more lenient. This worked to my benefit, as my pre-reqs are obviously very low, and yet I've maintained all A's (except for 1 B), in the program so far. I would assume there is a limited number of seats. How many though, I do not know.
Because you have the freedom to make your own schedule, many of us sign up for a full coarse load, even though we're in the part time program. The downside to this, of course, if you see it that way, is that your courses are all evenings and weekends.