Textbooks on iPad

Hey guys,

I'm a college student and have seen a bunch on using a iPad as a main source for textbooks. I know there is an up and coming site/service, KNO, that has a lot of textbooks, but how effective are they really? Would I be able to have all of my textbooks on there and be able to take notes, bookmark pages, and effectively study? Does anyone have experience with another app or service?



PS. I need some good answers so I can convince the parents to buy it instead of me! ;)