N900 Standard stylus is also plastic like this Wacom Nib.
To me there is no other differences than "weight" and "ergonomic".
I can not draw with standard stylus long period of time.

There could be a lot differences when using standard stylus or
style pen. MyPaint Brushes reacts differently..

Sometimes I could use N900 standard stylus.. with my Sketcher..
pencils like "Sketcher 1".. Trick is to FLIP stylus and use other bulkier tip for drawing ... you
can do shading with it easier ... because more styluses surface area touch to the screen... -> Strokes are different

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harp - I have not used Vikuiti screen protector but at first my N900
screen was covered with some cheap slippery plastic one..
I did like it a bit .. but only when I using very sharp pinpoint pencils.
Surface was hard so pen glides easily but I do prefer now this one.
It is much easier to draw eg. on the moving bus.

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EDIT:

There is now in Youtube ... mine second video about MyPaint..

http://www.youtube.com/watch?v=c4z1svphlJM

Btw. I try to do proper brush set for MyPaint.. now
Mine "Tone" set is bit confusing... brush names are not correct and
there is some misspellings .. like "Tones's" ...

I have also done some more brushes.. like the old ... Liner Brush..
which is my opinion very useful.. it works faster than "shift" lines.