i will say this, its fragile, i think i broke the first one, returned it and discovered how FREAKING AWESOME it is for drawing detail, especially if you're neurotic or suffer from OCD. i added a few examples, just quick sketches, nothing fancy or anything.
another good use for this pen is detailing watercolor work, it will bleed if the piece hasn't dried, so depending on what you're trying to do, be aware of that.
its refillable, which is nice, india ink isn't all that pricey, and as im typing this i just worked out that i could easily change in colors, huh, guess ill have to test that out.
the pen does have its limitations, it is small, the smallest point size that i have used to date. the tiny size can get you lost in detail work for hours, and hours (trust me, i know) its a good pen for surgical strikes, sniper style, get in, achieve your objective, and get the hell out before somebody gets hurt(usually the pen itself sadly). seriously, if you need to get a lot of ink on the paper you might look into a more durable pen for the main lines and shadows and come back for the nuances. using this pen as your sole tool, would be like building a skyscraper out of toothpicks.
if you plan on getting one of your own i suggest that you look for one on amazon or other online retailer, and also that you NEVER UNDER ANY CIRCUMSTANCES LET ANYONE ELSE USE IT... it will break and you will cry.