The Blue o' blue Special Edition was the first M800 series pen to enter my collection. It ranks just behind the Tortoiseshell Brown in terms of my overall favouritism, but is probably the prettiest M800 I own. Since March 2011 it has passed through my rotation fifteen times.
The nib of course is a Richard Binder grind from a medium into a 0.7mm Cursive Italic. This nib is a joy to use and makes my handwriting semi-interesting.
The ink is iroshizuku ajisai (ajisai being Japanese for Hydrangea) is lovely blue that unsurprisingly echoes the colour of the flower.
The nib makes the ink more interesting than it would normally be. A nice inoffensive colour that is often over-shadowed by the more illustrious iroshizuku shades.