I bought one direct from planet a while ago, as the second hand marker (3.2) i had didn't come with one.
( I'm a tart) don't think i ever used it and sold it with the marker.
I used the soft and hard tip in a GSL to trial it and didn't notice any difference in how it shot paint.
Only notice difference in sound is if i use the pro tip.
I've got 2 X 3.5's and use the hard tip for everything, Winter to 5*, my advice just use the hard tip, less problems with loosing the rubber tip allegedly.