Very discreet appearance. I have filled mine with Waterman Intense Black in and it makes the pen look almost a solid black throughout. A good vac filling system that fills about 3/4 of the chamber on the first plunge and a smoother plunger than my TWISBI Vac 700r. The nib is surprisingly smooth for an "F" nib and on the EF side of Fine. With the larger chamber and the fine nib, this pen will write a very longtime between refilling. I have yet to test it on a plane but I think this can easily fill the role of an every day for work as well as pleasure.