From what I understand about the program, you do all your classes at Columbia. Some days you have clinical, some days you have classes (about 2-3 days per week) - but it's not distance learning.
I ended up choosing Yale over Columbia because it's a better fit for me, and because of various factors, including cost of living, it made more sense for me to choose Yale. I start in August.
I'd definitely recommend reading 2009-2011's ETP posts, they're pretty helpful and provided me with a lot of useful information. I will tell you that the CNM and the CRNA programs are the most competitive because they have to organize clinical placements ahead of time so enrollment is restricted. As for the other specialties, you can fairly easily switch your specialty after starting the bachelors portion of the program. They take a large class and don't do interviews which may be a plus for some and a minus for others.