I'm liking it, but probably won't use it for notes. Just for doodling and maybe quick concept sketches. I splurged and got the full package. I use the included pen and the water color brush (because it's cool) the most, but the sketch pencil is also useful.
The other two brushes are more practical for taking written notes, and I prefer to type for that kind of thing.
Erase works very well. the size of the erase depends on how fast your brush. Fast takes out big broad stokes for quick erasing. Slow is precise for cleaning up details.