First of all, the stylus IS pressure sensitive, which is nice. The pressure curve is a bit odd though: you have to push down pretty hard to get full pressure and it doesn't go quite as light as I'd like, but it is totally still useful and accurate.
Eraser can be triggered by holding a button. It isn't a soft eraser, very hard edged, but fine.
Pen on glass can feel annoying but I fixed it by buying a matte screen protector, which dulls the display a bit but makes the surface feel much more like paper.