The retractable tip on the GraphGear 1000 is a game changer. I'm not even terribly particular about pens and pencils, hell, I'm barely literate... But we've all been losing pencil tips forever, and when it's a pencil /machine/ the tip is all.
MD I'd buy a set of 1000's like this in a heartbeat. I doubt I'd ever even need to refill 'em, they'd last forever.
These 500's though...heartbreak guaranteed. They can't even be shipped without risking their sole function.