Regardless of how good they are (I don't know, I haven't seen them), why waste your money? You have to enroll on an approved course, and you will get a full set of notes when you do so (maybe even the same notes, depending on your choice of school), so you don't need more notes.
To be honest, I would do the same. If you are in the position to get a head-start, why not go for it?
Don't forget that each individual is different. While some can digest the vast amount of information in a short space of time, others can't. Students range from a young person living at home without any responsibilities, right up to a person who is married with perhaps 5 kids, a mortgage and full-time job.