Took the plunge:
yes, some of the holders themselves are just cheaply made pens, but they look better than most stylii;
the tips, tho are superb - such a light touch makes accuracy much easier, tho it is a bit counter-intuitive at first.
Even if you press too hard, making the felt tip flat & less responsive, it's easily fixed by fluffing out the felt (toothbrush, or even Velcro "teeth").
Just don't crew around with the holder (like twisting or separating the ones made from Cross style pen holders)...