well if you need to ask that question, i would say you're not ready for a DSLR haha, not to be mean.
the only disadvantages of a DSLR is that its quite a bit bigger than any point and shoot and way more expensive.  a DSLR gives you full control over the ISO, shutter speed, aperture, etc. also, you can change lenses. also, there's virtually no shutter lag with a DSLR.  but unless you know a lot about photography, i wouldn't get one if i were you haha.