yeah in my degree, a lot of ppl "dropped out" but actually just transferred to other courses, rather than dropping out of uni all together. however i have had a few friends that did drop out alltogether.
Most ppl drop out coz its boring or coz its not what they expected, rather than the work being too hard.
And they dont give you very long to try it out befor you drop it, you only get 3 weeks to decide whether or not the course is for you before you gan get out without paying HECS, i'm a "give it a go - it might get better" type person, so i was stuck in after march 31st coz it would have been stupid to drop out after then coz i would have had to pay.