Ipads are more convenient than they are functional. Right now there's very little advantage (productivity-wise) that an iPad offers.
But being technologically more efficient doesn't matter much for medical school. There is no way in hell that a business that needed to do actual data entry would primarily use iPads. As for on the go or accessing/reading information, iPads are great.
In the end, this becomes a silly debate though, because being a great student has very little to do with what technology you use (i.e. some people are computer-dumb but are top students). Which goes back to my point, in a real business where data entry was really important, iPads wouldn't fly. See if any hospital uses iPads as their primary device... none will because they just aren't there yet, but again they can be used as a secondary device brilliantly, which is why they are as popular as they are.