When you write notes and letters it is nice to have a good pen. I mentioned the Pilot Metropolitan Fountain Pen (Black Plain, Fine nib, although you have many choices), a bargain at $15, in another blog post: The Joy of Letter Writing, September 7, 2015, in my Plano Parents blog. I bought it from the Goulet Pen Company (http://www.gouletpens.com/). You can also find a nice description of rollerball pens in this article: Letter of Recommendation: Uni-ball Signo UM-151 By TOM VANDERBILT, New York Times Magazine, MAY 21, 2015. I have been using the Uni-ball Signo UM-151 and I like it, although it is so sharp, 0.38 mm, that it takes a little time to get used to it. I like the way the cap snaps onto the pen with a solid click both to cover the pen for storage or to click the cover onto the end in order to write with the pen. I like writing with the Uni-Ball Vision Elite Micro Point (0.5 mm). There is also a Bold Point (0.8 mm). The cover, or cap, clicks closed very nicely, but it is a little mushy when you try to snap the cover onto the back of the pen. I usually put the cap on the table, but I do like this pen and use it regularly. It has a nice ink flow and a satisfying heft. I have re-purchased it.
One pen I liked from this article is the Pentel EnerGel. I use this pen frequently. It is a retractable liquid gel pen, 0.5mm. I use it to write post-cards. I also ended up getting a Uni-Ball 207, a 0.7 mm pen, which I enjoy because it is retractable. This is the pen I now use for standard applications, like addressing envelopes and writing checks.
There is a list of 5 top pens on the Pen Addict website: http://www.penaddict.com/top-5-pens/
Enjoy writing with a good pen!
Robert