(Ok lets use this thread- here's my comment from the other thread.)
Keep grades consistent through the JC and the senior university later on and you should be fine. Careful with JC counselors! They often aren't familiar with the needs of premeds/transfer students. Stay on top of transfer requirements (you probably wont need the AA/AS degree to transfer.)
There aren't any disadvantage to going to a JC. PM me if you have specific questions about getting to medschool as a CC transfer student.