I wish my school bought KISS notes for us. I mean, I'd still write my own notes, but they'd be handy as a reference. Still, lucky my brother has a few topics.
we get them for chem and phys. they are reasonable summaries.
our teacher says that they will get you a band 4, apparently they are not detailed enough.
The best notes are the ones you make yourself using a variety of sources.
I use the KISS notes as a bunch of good notes to help write my own. I don't think any but your own will ever be properly complete. I still think they are very good.