This pen interests me because its nib is supposedly soft or springy. I found two threads on it but I'd like some opinions, anecdotes, reviews, writing samples, etc. if possible. Other things I'd like to know (I know I have a lot of questions - sorry!): Are all the non-demonstrator pens translucent? If not, which ones are? Are there any differences between the demonstrator (Cool) and non-demonstrator (Balance PGB-3000) pens besides the transparent material (design, springiness, etc.)? How durable are the pens in your experience? Does anyone have pictures of a Platinum Cool (demonstrator) with the converter inside, loaded with ink? Most online pictures show empty pens. I suspect they look prettier that way. Do they?Thanks!