Someone mentioned early on about community college. Berkeley extension isn't a community college. Admissions Committees know about Berkeley Extension and it has a solid reputation.
I've done a little over half of all the premed requirements here.
Classes are expensive and teachers are a crapshoot. Some amazing, some awful. Many are in between.
This is the program for working professionals. You have to be an independent learner, and you have to have your **** together overall. Typically the students I have met are high-caliber, accomplished career switchers. Many former bankers, consultants, lawyers. Folks with MBAs. I don't think this program is geared much to folks who just want to increase their GPAs to increase their chances of getting in, but surely I've met those, too.
Classes are all 1x a week, except for the accelerated summer term. This means the professor goes over a ton of material in one class, or doesn't even get to it all. You really have to be independent, dedicated, and focused if you're going to do well in these courses.
But students have had excellent acceptance rates. I know of numerous people who ended up at UCSF, for example.
I can't speak to advising because I never formally applied to the program to get it. I just enroll in courses one after another. I might apply and enroll in a bit, because they do offer a group letter on behalf of the faculty for each student in the program.
But that's not required. I already have a letter coming from my chem professor.
Classes are all over the bay. I've taken the majority of my courses in Belmont, CA, but have had many in Berkeley, too, and this term I finally have some in SF, where I live.
Hopefully this adds a bit of color to the school for folks thinking about it.